Costco — What to Know
How Costco's membership model works, what's actually worth buying in bulk, and practical tips for making the annual fee pay for itself.
Costco is a membership-only warehouse club that sells bulk quantities at lower per-unit prices. Whether the $65/year fee is worth it depends entirely on what and how much your household consumes.
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How It Works
You must purchase an annual membership to enter and shop. Two tiers exist:
- **Gold Star** — $65/year. Standard membership. Access to all warehouse locations and Costco.com.
- **Executive** — $130/year. Adds 2% cashback on purchases (capped at $1,250/year back). Worth it only if you spend roughly $6,500+/year at Costco.
One membership card allows one additional free household card for someone living at the same address.
**Payment:** Costco accepts Visa credit cards only (no Mastercard, Amex, or Discover). Debit cards and cash are accepted regardless of network. The Costco Visa card offers an additional 2% back on Costco purchases.
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What's Worth Buying
**Eggs** — Significantly cheaper than any grocery store, especially for large quantities (5 dozen packs).
**Meat in bulk** — Whole pork loins, packs of chicken thighs/breasts, ground beef in large trays. Per-pound pricing is substantially lower than supermarkets. Portion and freeze what you don't use immediately.
**Household staples** — Toilet paper, paper towels, laundry detergent, dish soap, trash bags. The per-unit cost is hard to beat, and these items don't expire.
**Diapers and baby wipes** — Kirkland Signature brand is well-reviewed and far cheaper per unit than retail.
**Kirkland Signature products** — Costco's house brand. Quality is consistently high across categories (olive oil, coffee, trash bags, vitamins, clothing basics). Often comparable to premium name brands at a fraction of the price.
**Gasoline** — Costco gas stations are typically 20–40 cents per gallon cheaper than surrounding stations. For a household that drives frequently, this alone can offset a significant portion of the annual fee.
**Rotisserie chicken** — $4.99 for a large whole chicken. This is a deliberate loss leader (they sell it below cost to get you into the store). Genuine value.
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What's Not Worth Buying
**Fresh produce in bulk** — A 3-pound container of strawberries or a 5-pound bag of spinach sounds like a deal, but perishables spoil before small households can finish them. Only buy bulk produce if you'll consume it within 3–4 days or plan to freeze it.
**Anything you only use occasionally** — A 2-pack of ketchup or a gallon of soy sauce saves money per unit, but takes a year to finish. The upfront cost ties up money for minimal savings.
**Items you haven't tried before** — Costco doesn't offer single units or small sizes. If you buy a 48-pack of granola bars and don't like them, you're stuck (though Costco's return policy is very generous — see tips below).
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Practical Tips
- **Go on a weekday or early weekend morning.** Saturdays after 11 AM are extremely crowded, especially the food sample stations.
- **Bring your own bags or boxes.** Costco does not provide bags at checkout. They have empty product boxes near the exit, but bringing reusable bags is easier.
- **The food court requires a membership.** Costco has been enforcing membership verification at food court kiosks since 2024, and the rollout is expanding. Some locations and online forums suggest workarounds still exist, but officially, a valid membership card is required to order. Don't plan a trip around the food court without one.
- **Return policy is extremely generous.** Almost anything can be returned at any time for a full refund, no questions asked. Electronics are the exception (90-day return window). If you're unsure about a product, buy it knowing you can return it.
- **Check the price tag codes.** An asterisk (*) in the upper right corner of a price tag means the item is being discontinued and won't be restocked. A price ending in .97 means it's on manager's markdown. Prices ending in .00 are the deepest clearance.
- **Pharmacy and optical do not require membership.** By law, these departments are open to non-members.
- **You can share the trip.** Your membership allows one additional household card for someone living at the same address. If you split purchases with someone, the fee effectively halves.
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FAQ
Can I use my Japanese Costco membership in the United States?
Yes. Costco memberships are global. If you already have an active membership from Japan, your card works at any US warehouse — no need to purchase a new one. The membership tier (Gold Star or Executive) carries over as well. This can save you $65 if you or someone in your household already holds a Japanese membership. Renewal dates and annual fees will follow whichever country's terms you originally signed up under.
Why was my credit card declined at Costco?
US Costco locations accept Visa credit cards only — no Mastercard, American Express, or Discover. This is the opposite of Japan, where Costco switched to Mastercard. If you arrive with a Japanese Mastercard expecting it to work, it will be declined. Your options: use a Visa credit card (Japanese-issued Visa is fine), any debit card regardless of network, or cash. If you plan to shop at Costco regularly, the Costco-branded Visa card offers an additional 2% back on purchases.
Can I use the Costco food court without a membership?
Officially, no. Costco requires a valid membership card to order from the food court, and enforcement has increased significantly since 2024 with the installation of membership scanners at food court kiosks. Some people online report that certain locations still allow non-member access (exterior food courts or locations that haven't installed scanners yet), but this is increasingly rare and not something to count on. The pharmacy and optical departments remain accessible without a membership (required by law), but the food court is now treated as a member perk.
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*Note: This guide provides general information only. Store prices and product availability change over time. For personalized guidance navigating stores with your family, see our [concierge services](/jp#contact) (Japanese-language support available).*