Sam's Club or Costco?

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Want in on a secret? Learn how non-members can shop at Costco.

What are the most popular products at Costco right now? Check out The 30 Best Finds at Costco to see what people are purchasing online. 

Before you buy, check out: 20 Items You Should Avoid Buying in Bulk

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Warehouse clubs offer great deals on some items -- but not all. Here are 10 Things Not to Buy at Costco, Sam's, and BJ's Wholesale Club.

Costco vs. Sam's Club: Which is Better?

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Deciding whether to join Costco or Sam's Club is no small task. Both warehouse giants offer an array of discounted goods and services including grocery items, prescription medications, electronics, automotive supplies and services, and more. Both also promise exceptional deals compared with conventional retailers. Which, if either, is the better choice? We became members and shopped at each to find out.

Jump to our price comparison breakdown and membership benefits comparison

A head-to-head comparison between Costco and Sam's Club reveals a host of similarities. When pressed to declare a victor, we settled on Costco -- by a hair. Sam's Club started with a very narrow price advantage: Annual memberships are $15 cheaper. But in a shopping cart of 30 items, we found more savings at Costco. Costco also has a larger in-store selection (particularly for organic and health foods), higher-end merchandise, discounted prescriptions at the lowest membership level, and greater rewards at the higher membership level. For its part, Sam's Club excels in technical support for electronics, provides more payment options, and has more locations. (Note: We did not include BJ's Wholesale Club in this comparison, because it lacks a nationwide presence.)

If you join just one warehouse club, assess your needs against each retailer's strengths and inventory before making a choice. Both Costco and Sam's claim large followings, and consumers seem to have their loyalties. Costco boasts more than 91.5 million cardholders spread across nearly 50 million households and Sam's Club has about 47 million members. We found few online reviews of the warehouse clubs overall; those we did find focus mostly on a particular product or service. We considered this user feedback in our evaluation of the two stores, informally polled consumers online, and noted the results of broader surveys. We also relied heavily on our own shopping experience in declaring a winner on a variety of fronts, from prices to pharmacy to return policy.


As of early 2018, Costco operated 747 clubs, including more than 200 located abroad. Of the 519 stores in the U.S. and Puerto Rico, nearly a quarter are in California. Costco locations also tend to cluster in urban centers. Sam's parent company, Wal-Mart, is closing 63 clubs, but that still leaves it with 597 Sam's Club locations throughout the U.S. and Puerto Rico. (BJ's counts just over 210 locations concentrated in the eastern U.S.)


Both warehouse clubs have two membership levels. Costco offers separate household and business memberships within those tiers, while Sam's Club has streamlined its membership options to only two.

The basic membership at Sam's Club costs $45 a year and allows up to eight add-on memberships for $40 each. At Costco, a basic Gold Star membership costs $60 a year and is for household use only. A Costco Business Membership, also $60 a year, allows for additional cardholders ($60 each) and lets shoppers resell merchandise.

For $100 a year, a Sam's Plus membership returns $10 for every $500 spent on qualifying items, up to $500 a year; grants extra savings on select prescription drugs without insurance; and allows up to 16 add-on memberships for $40 each. Plus members also get early-bird shopping hours and free shipping on most items with no minimum purchase, a new benefit. Costco's Executive Membership, which costs $120 a year, provides extra savings on available services, plus 2 percent back on qualified purchases, including travel, up to $1,000 a year. Costco's Executive Business Membership (also $120 a year) includes cash-back benefits as well as additional cardholders and resale.

Bottom line: Sam's Club memberships are cheaper, but the higher fee at Costco might be a good investment for shoppers who take advantage of the club's wider selection of cut-rate services and its robust prescription program (a feature that requires a membership upgrade at Sam's). The better cash-back offer makes Costco's Executive Membership the cheapest deal for big-time warehouse shoppers. Both clubs give full refunds to customers unhappy with their shopping experience.


To compare Sam's Club and Costco prices, we shopped for a family of four, including an infant, at stores in the same Dayton, Ohio, market area. Into our cart went 30 perishable and packaged grocery items, personal care products, and other household essentials. Item for item, we tried to pick the same brand in the same quantity at each wholesale club. We also calculated the price per unit -- per ounce, per diaper, etc. -- to account for differences in package size. When possible, we selected in-house brands (Member's Mark and Daily Chef at Sam's Club and Kirkland Signature at Costco). participates in affiliate marketing programs, which means we may earn a commission if you choose to purchase a product through a link on our site. This helps support our work and does not influence editorial content.

Price Comparison Breakdown

ProductSam’s Club
(Unit Price)
(Unit Price)
American Cheese
Member's Mark/Kirkland Signature
Applesauce (Organic)
GoGo Squeez
(50¢ ea.)
(50¢ ea.)
Baby Formula
Del Monte/Dole
Bread (White)
Sam’s Club
Chocolate Chips
Diapers (Size 2)
(21¢ ea.)
(22¢ ea.)
Disinfectant Wipes
(4¢ ea.)
(4¢ ea.)
Dryer Sheets
(3¢ ea.)
(3¢ ea.)
Bell Peppers
($1.16 ea.)
($1.17 ea.)
Frozen Chicken Breasts
Daily Chef/Kirkland Signature
Sam’s Club
Frozen Vegetables
Daily Chef/Kirkland Signature
Greek Yogurt
Ground Beef$3.28/lb.$3.29/lb.Tie
Instant Oatmeal Packets
(19¢ ea.)
(19¢ ea.)
Sam’s Club
Laundry Detergent
Orange Juice
Paper Towels
Member's Mark/Kirkland Signature
(78¢/100 sheets)
(82¢/100 sheets)
Sam’s Club
Peanut Butter
Sam’s Club
Pretzel Sticks
Shredded Mozzarella Cheese
Member's Mark/Kirkland Signature
Spaghetti Sauce (Organic)
Member's Mark/Kirkland Signature
Sam’s Club
Member's Mark/Kirkland Signature
Toilet Paper
Member's Mark/Kirkland Signature
(18¢/100 sheets)
(13¢/100 sheets)
Crest Complete
Trash Bags (13 gal.)
Member's Mark/Kirkland Signature
(7.4¢ ea.)
(7.5¢ ea.)
Sam’s Club
Bottled Water (16.9 oz.)
Member's Mark/Kirkland Signature
(7¢ ea.)
(7¢ ea.)
Average Savings7.7% on 7 items11.4% on 9 itemsCostco

Nearly half the items cost essentially the same at both stores (less than a 1 percent difference in unit price). Seven of the 30 items came out cheaper at Sam's, by an average of less than 8 percent. Costco bested Sam's Club's prices on nine products, with average savings of more than 11 percent.

The super-size packages of many items at wholesale clubs may deter some consumers, especially those with few family members or lacking lots of storage space. At both stores, for example, American cheese comes in 5-pound packages -- can you eat that many slices before they expire? Such large amounts are no doubt useful for parties, daycare centers, group picnics, and big families. Our hypothetical family of four would find a Sam's Club or Costco membership most valuable for stocking up on cleaning supplies, paper goods, condiments, baby supplies, and grocery items that won't spoil anytime soon. For consumers worried that bulk buys will go to waste, it's worth noting that in the cases where package sizes differed, Sam's Club more often sold a smaller quantity.

Extra Savings

Both clubs play the discount game. Special offers are automatically taken at checkout. Costco mails out coupon packets monthly. Mailings from Sam's Club are more sporadic. We saw several "instant savings" discounts when ambling down the aisles at both stores, and members of both retailers can keep track of the latest deals via mobile apps. Both clubs' websites show dozens of current offers, both in store and online. We didn't include such savings in our price comparison, because shoppers can't count on the discounts to be available when they visit the store. But it's worth noting that there were discounts on five of the items we priced at Costco and three at Sam's Club. The savings usually ranged from about $2 to $4.

Shopping Experience

Costco edged out Sam's Club in the 2016 American Customer Satisfaction Index, based on annual interviews with 70,000 customers, and is the top-ranked specialty retailer for customer satisfaction. However, Sam's Club earned a slightly higher score than Costco in the 2017 Temkin Experience Ratings, which asked 10,000 U.S. consumers to rate their recent interactions with the two warehouse clubs and more than 300 other companies, from airlines to wireless carriers. A video review from Consumer Reports says Costco rates a bit higher than Sam's in a customer satisfaction survey, but it's unclear when the survey was conducted.

We visited both clubs on weekdays when crowds were thin. The Sam's Club location felt a bit more cramped, with more merchandise shoved into a smaller space. Sam's Club stores are, on average, smaller than Costcos: 134,000 square feet vs. 144,500 square feet, according to the companies. One feature we noticed at Sam's and not Costco is self-checkout lanes. Although these can be convenient for shoppers who come in for only a few items, we're not sure how practical they are for the typical shopper stocking up on large, unwieldy items. More of a boon is Sam's Club's free pickup service, which allows members to place an order online and schedule a pickup time at the store. At some clubs, shoppers don't even have to get out of their cars to claim their items. At others, shoppers go inside and check in with their membership card before a club associate retrieves the order.

Costco does not have in-store pickup, but it does have a same-day-delivery partnership with Instacart for groceries and household supplies in some metropolitan areas. There is an order minimum of $35 and additional delivery fees apply. There is also a two-day delivery service for non-perishable groceries and household supplies. This one is available nationwide and is free for orders of $75 or more.

Both wholesale clubs claim fans and detractors. In Cheapism's online poll, respondents posted numerous gripes about service at Sam's Club. For example, Jeff Rigg of Columbus, Ohio, wrote: "Costco employees actually seem interested in helping you and trying to get you checked out quickly. Sam's Club is more like going to the DMV." Although experiences like this may vary from location to location, Sam's Club is dogged by concerns about the employment practices of parent company Wal-Mart, while Costco was lauded as America's Best Large Employer for 2017 in a survey of 30,000 workers conducted by Forbes and Statista.

Product selection, availability, and quality also affect the customer experience. Costco fans enthuse about the quality of the in-house Kirkland Signature brand, and indeed Costco has more entries than Sam's on our list of store-brand foods that beat their name-brand competitors. A poll respondent with memberships at both warehouse clubs said the produce she buys at Costco always lasts longer. Others asserted that Costco seems to carry more upmarket inventory and a larger selection of healthy and organic products. One Sam's Club advocate stood firm against the tide in appreciating the steadiness of the store's offerings compared with a seemingly ever-changing assortment at Costco (an effort by the company to encourage impulse buys and frequent visits). Several other shoppers value the savings at Sam's Club.

Broadly speaking, the range of departments at both stores is very similar, as is the assortment of inventory. In addition to groceries and household essentials, each superstore sells electronics and computers, apparel, home goods, pharmaceuticals, health and beauty products, toys and video games, sports and fitness equipment, automotive supplies, and photo printing. Some Sam's Club and Costco locations also operate gas stations, where prices generally undercut the local competition. Differences between the two are more apparent in the array of available services across departments.


In the auto departments at Sam's Club and Costco, a similar selection of tires and accessories carry largely equivalent prices, but the available services vary somewhat. Both stores offer free rotation, balancing, and flat repair for the life of the tires they sell. Sam's edged out Costco in our tire installation comparison in large part because of its 24/7 roadside tire changes, offered to customers for three years from the date of purchase.

Both Sam's Club and Costco also have auto-buying programs that offer haggle-free vehicle pricing for club members. Costco offers breaks on car insurance through Ameriprise and additional benefits for executive members, including roadside assistance, lifetime renewability, and glass repair reimbursements. Finally, Costco offers 15 percent off parts, service, and accessories up to $500 at participating service centers.


Both clubs offer a large variety of electronics at very similar prices. The cost of a 70-inch Vizio TV, for example, was $999.99 online at Costco and $999 for the same model at Sam's Club. That's a 99-cent difference on a $1,000 TV. The same was true on a Canon EOS Rebel T6 camera bundle (including two lenses, a case, and a 32GB SD card): It was $749.99 at Costco and $749 at Sam's. Both clubs require members browsing online to sign in to see prices for many electronics, which can make comparison shopping onerous.

Sam's Club offers members free 24/7 tech support by phone to help with troubleshooting and setup for select electronics. Free tech support from Costco is available from 5 a.m. to 10 p.m., excluding holidays. Costco extends the manufacturer's warranty to two years for most computers, TVs, displays, projectors and major appliances. Both warehouse clubs also offer extended warranty plans on select products through SquareTrade, but Sam's Club's SquareTrade plans include free delivery and setup for TVs over $500. Both stores limit the return window to 90 days for most electronics. Cellphones and other carrier-connected devices must be returned within two weeks to Sam's Club, however.

Financial and Business Services

Most large retailers these days have their own credit cards, but these two stores feature an array of other financial services, as well. Costco offers check printing and credit monitoring; home mortgages and refinancing; and discounted home, life, and identity theft insurance. In addition, businesses can take advantage of payment processing, payroll services, phone services, and discounts on productivity software.

Sam's Club offers a similar menu of services, including discounted insurance, check printing, and credit monitoring. While the club doesn't provide mortgage services, it does offer discounted accounting services and tax help. Like Costco, it offers business services such as payment and payroll help; it can also arrange discounted small business loans through partner banks. The average shopper probably won't join Sam's or Costco to take advantage of these services, but they're worth checking out.

Health Services and Pharmacy

Costco shoppers at any membership level can get between 2 percent and 40 percent off medications when not using insurance coverage for prescription drugs by signing up for the Costco Member Prescription Program. Sam's Club members paying out of pocket for prescriptions must upgrade to Sam's Plus ($100 a year) for benefits that include $4 to $10 generics, up to 30 percent off name-brand drugs, and even a handful of free medications. Both pharmacies provide flu shots, and you don't have to be a member to receive one. In our 2017 price comparison, Costco was the cheapest, at $20, while Sam's Club offered the shot for $30. Sam's Club Plus members receive 8 percent off immunizations.

Further research reinforces Costco's advantage. A recent Consumer Reports investigation found that shoppers would save more than $120 if they bought five common prescription medications at Costco instead of Sam's. That bolsters a previous report by the magazine, done in 2013, that also found a significant price advantage for Costco. (The surveys reflect the total retail prices of the drugs without insurance and without member discounts.)

Both retailers provide optical services at many of their stores. Sam's Club offers a relatively broad set of free health screenings, including cholesterol, glucose, blood pressure, body fat percentage, and hearing tests. Memberships are not required for Sam's health screenings. Costco focuses on periodic osteoporosis, heart, and diabetes screenings at select stores. It also offers free hearing tests, hearing-aid cleanings, and hearing-aid checkups.


While Sam's Club discontinued its travel services at the beginning of 2017, many consumers look to Costco for travel planning and discounted travel booking online and over the phone. Members get reduced rates on hotels, vacation packages, cruises, and rental cars. One shopper told Cheapism, "We've always been Sam's Club members, but then we discovered the car rental discount through Costco. The Costco membership is so much more valuable to us now because it makes renting a car so much cheaper on our yearly vacation." Costco's executive members now get a 2 percent reward on travel services, too.

Payment Methods and Guests

Paying for a full shopping cart can be tricky at Costco. The only credit card the store accepts is Visa (the club's exclusive partnership with American Express ended in 2016). Sam's Club, on the other hand, accepts American Express, MasterCard, Visa, and Discover. Cash, check, and debit are valid options at either club.

Both clubs allow members to bring in up to two guest shoppers per shopping trip, but only members are allowed to purchase most items.

Return Policies

Neither store sets a deadline for returns of most merchandise, with the exception of electronics (most of which have a 90-day return window). Although both stress that a receipt is preferred, they will attempt to process returns without one. Sam's specifies that refunds may occasionally be made in the form of store credit.

Both retailers accept returns of online purchases in-store. Refunds for online orders from Costco include shipping and handling fees. Sam's Club refunds the shipping cost only if the return is the result of an error.

Membership Benefits Comparison

CostcoSam’s ClubWinner
Locations- 519 in the U.S. and Puerto Rico (747 worldwide)- 597 in the U.S. and Puerto RicoSam’s Club
Membership- $60 for household or business
- $120 for executive or executive business (2% reward up to $1,000 a year)
- $45 for household
- $100 for Plus ($10 reward for every $500 spent (2%) up to $500 a year)
Sam’s Club
Price Comparison- 9 items cheaper by unit price
- Average savings of more than 11%
- 7 items cheaper by unit price
- Average savings of less than 8%
Extra Savings- Offers mailed monthly
- Discounts on dozens of products
- Mobile app displays offers
- Offers mailed several times a year
- Discounts on dozens of products
- Mobile app displays offers
- Higher rankings in customer satisfaction surveys
- Larger selection of organic and health food
- Higher-end brands and a perception of higher quality
- Same-day grocery delivery and 2-day delivery for non-perishables
- Good selection
- Lower product turnover
- Self-checkout
- Free store pickup
Automotive- Tires with free rotation, balancing, and flat repair
- Auto insurance with additional benefits for executive members
- Car-buying service
- Discounted service and parts from participating service centers
- Tires with free rotation and balancing as well as 24/7 roadside tire assistance
- Car-buying service
Electronics- Free technical support 5 a.m. to 10 p.m.
- Extended 2-year warranty on many purchases
- Optional third-party protection plans
- Free 24/7 technical support
- Optional third-party protection plans that include delivery for TVs
Financial & Business Services- Check printing
- Credit monitoring
- Mortgages and refinancing
- Home and life insurance
- Identity protection
- Health plans, payment processing, payroll, and phone services for businesses
- Check printing
- Identity protection
- Small business loans
- Health plans, payment processing, payroll, and legal services for businesses
Health Services and Pharmacy- 2% to 40% off prescriptions
- Cheapest generic drugs in multiple price surveys
- Periodic health screenings
- Optical services at many locations
- Free hearing tests including hearing-aid cleaning and checkups
- Cheaper flu shots
- 8% off brand-name drugs and 40% off generics with Plus membership
- Periodic health screenings
- Optical services at many locations
- Free hearing tests
Travel- Discounts on hotels, rental cars, vacation packages, cruises, and theme parks
- 2% reward on travel purchases for executive members
- No longer offers travel servicesCostco
In-Store Payment Methods- Cash
- Check
- Debit
- Visa
- Cash
- Check
- Debit
- American Express, MasterCard, Visa, Discover, store credit card (also good at Walmart)
Sam’s Club
Return Policies- No deadline for most items
- Receipt preferred but not required
- 90 days for electronics
- Online refunds include shipping and handling
- No deadline for most items
- Receipt preferred but not required
- 90 days for most electronics
- 30 days for contact lenses, golf carts, and vending machines
- 14 days for cellphones and other connected devices
- Online refunds do not include shipping and handling unless return results from store error or shipping damage

Costco Review

Cheapism's Costco review found much to praise. Memberships start at $60 -- $15 more than Sam's Club -- but even the cheapest provides access to an abundance of low-priced services and savings, such as home and auto insurance and discounts on prescription drugs. Consumers who regularly shop at Costco award gold stars to the employees and to the merchandise. "For me, it's about business practice and quality of products, and Costco excels at both," said one respondent to our online poll. She deemed the in-house Kirkland Signature line "exceptional" and said it affords her the "healthy choices" she demands for her family. Another commenter wrote, "Hands down -- from employees, to produce, to organic meats and seafood -- Costco is light years ahead of Sam's."

Costco sells the usual assortment of discounted items, often in bulk quantities that seem destined for large families or small businesses, in categories ranging from groceries and automotive supplies to office supplies, clothing, electronics, jewelry, personal care products, and more. Pharmacies and Costco Optical centers are widespread. Some locations even sell funeral caskets and cremation urns. Many are graced with members-only gas stations that post aggressively competitive prices. Shoppers with a regional penchant are likely to find some locally sourced food items on the shelves.

Costco offers additional savings with in-store deals on a rotating variety of items and posts consistently low prices on photo printing and medications. Members at any level who don't have prescription drug coverage qualify for savings in the pharmacy department, which range between 2 percent and 40 percent on medications. By contrast, discount drug prices at Sam's Club are offered only at the highest membership level.

In two particular realms, Costco outshines Sam's Club. The organic and health food offerings at Costco are a boon to consumers who are conscientious about their diets and their wallets. Costco made news a few years ago by surpassing Whole Foods as the largest purveyor of organic foods in the country, with estimated sales of at least $4 billion. We've spotted organic produce and pantry staples, including strawberries and blueberries (in season), salad greens, frozen vegetables, eggs and milk, olive oil, bread, canned tomato products, sugar and raw honey, ground beef, and wild-caught salmon. Organic offerings at Sam's Club are a bit more sparse.

The range of services available at Costco also bests Sam's Club. Costco offers free hearing services including hearing aid testing, cleaning, and battery replacement. Members can claim discounts on car purchases and service through select dealers and reduced rates on auto, home, life, and identity theft insurance through third-party vendors. Business services include payment processing; health, dental, and vision plans; and phone and payroll services. Among the other offerings are check printing; water delivery; home mortgages and refinancing; and free rotation, balancing, and repair with tire purchases. Costco offers discounts on travel, too; Sam's Club has discontinued its travel services.

We conducted an in-store shopping cart test to compare prices with Sam's Club. Of the 30 products on our list (groceries, cleaning supplies, baby items), unit prices at Costco undercut Sam's Club on nine (including American cheese, Greek yogurt, toilet paper, and toothpaste) for average savings of more than 11 percent. In general, we saw more in-store discounts at Costco, and we did not apply those limited-time offers in our price comparison. We also priced out an LED TV, a DSLR camera, photo printing, and a flu shot. Flu shots are $10 cheaper at Costco, while the price of 4-by-6-inch photo prints is the same (17 cents). Electronics are also competitively priced, with Sam's undercutting Costco by only 99 cents on the two big-ticket items we compared.

Costco offers a return policy that is widely lauded as one of the most generous in retail. Members can bring back merchandise without a receipt and there is no time limit on items other than electronics, which must be returned within 90 days. One strike against Costco: Visa is the only credit card accepted in stores, although cash, checks, and debit cards are also welcome.

Costco's Gold Star membership -- the basic level, for $60 a year -- is for household use. A $60-a-year business membership entitles the member to add more cardholders (at the same $60 annual fee for each card) and to resell purchased merchandise. Executive memberships go for $120 a year and return 2 percent on purchases up to $1,000, including travel, and offer steeper discounts on some services cited above.

Overall, Costco holds a very slight lead over Sam's Club as our preferred warehouse club. Considering the range of organic and health food options, the quality of Kirkland Signature items, generous discounts at the pharmacy for all members who lack insurance coverage, and extensive service offerings including travel, Costco is well worth the price of membership.

Sam's Club Review

Although our comparative review gives Costco a very slight edge, Sam's Club makes a strong case for membership and appeals to frugal consumers looking for low prices. Sam's Club offers memberships starting at $45, which is $15 cheaper than Costco and includes perks such as in-store pickup for online purchases, 24/7 technical support on electronics, free flat tire repair, and multiple payment options.

In an online poll conducted by Cheapism, shoppers tell of stocking up on paper products, frozen foods, and other items packaged in bulk and taking advantage of deals on home office supplies. Fans of the warehouse club point to location, shopping hours, and limited crowds as big bonuses. Sam's Club garners far fewer positive reviews than Costco for the quality of the merchandise it carries, including store brands such as Member's Mark. Still, one shopper reports a particular fondness for the beef tenderloin and baked goods, "especially their birthday cakes."

Sam's Club delivers substantial savings in more than just groceries, automotive supplies, sporting equipment, eyewear, and apparel. Many of the stores are adjacent to members-only gas stations, which dispense fuel at discounted prices. In-store pickup is free for merchandise bought online, a convenience that Costco doesn't offer. Members also can call on 24/7 technical support for electronics bought at Sam's compared with limited hours at Costco. The array of lower-cost personal and business services includes free flat-tire repair and 24-hour roadside service for tires installed at Sam's, hearing tests, and monthly health screenings at select locations. Check printing; protection plans for electronics and jewelry and watches; and small business loans, payment processing, and payroll are offered through third-party providers.

Consumers can join the club at two membership levels. Sam's Club's basic membership costs $45 a year and allows add-on memberships for $40 each. Sam's Plus, at $100 a year, extends the most perks: additional discounts on hundreds of prescription medications (and five that are free) as well as special pricing in the absence of insurance for prescription drugs; $10 back for every $500 spent, up to $500 a year; $50 off eyeglasses with a year's supply of contact lenses; early-bird shopping; and $40 add-on memberships. In addition, Sam's Club features a Collegiate Membership for students that includes a $25 gift card when signing up or renewing; military personnel get a $10 gift card.

In a comparative shopping cart test, with Costco as the foil, we filled a cart with 30 items, mostly groceries and household supplies, including pretzels, bread, fresh peppers, bananas, yogurt, shredded cheese, orange juice, frozen veggies, frozen chicken breasts, mustard, ketchup, paper plates, paper towels, trash bags, laundry detergent, baby formula, diapers, and toothpaste. We noted that unit sizes were slightly smaller at Sam's Club than at Costco, a factor that may encourage consumers with smaller families to choose Sam's. The unit cost of seven items, including bread, frozen chicken breasts, and ketchup, was an average of 7.7 percent lower at Sam's Club. But Costco posted lower unit prices on nine products, for average savings of more than 11 percent over Sam's Club. Sam's undercut Costco by the slimmest of margins on the electronics we compared, and both clubs charge 17 cents each for a 4-by-6-inch photo print. At Sam's a flu shot is $30, a $10 premium over Costco.

Sam's Club is more flexible than Costco when it comes time to pay. Stores accept all major credit cards in addition to a Sam's credit card, debit card, cash, or check. As for returns, Sam's policy says a receipt is preferred, but "we will do our best to process your return without it." Although there's no deadline for returning most items, members have 90 days to bring back most electronics and just two weeks for cellphones and other connected devices.

We're big fans of wholesale shopping in general, and Sam's Club meets expectations. Our local store was clean and well-stocked, with a wide assortment of merchandise and brands, if a bit more cramped than Costco. The option of multiple payment methods is a big draw, and Sam's boasts some services that its rival doesn't. Overall, Sam's Club membership is a good deal.