14 Items You Can’t Return at Costco Even With Membership

Although Costco is known for its generous return policy, some items cannot be returned once purchased. Knowing which products are final sale before you shop can save time and disappointment. Below is a clear guide to 14 categories that Costco typically won’t accept for return, along with concise explanations to help you make informed decisions.

Custom-made Items

Personalized or custom-made items—such as engraved jewelry or bespoke furniture—are tailored specifically for the buyer and cannot normally be resold. For that reason, Costco treats these purchases as final sale. Verify all details, measurements and personalization choices before completing the order to avoid disappointment.

Alcohol

Returns of alcoholic beverages are governed by state laws, which vary widely. Some states restrict returns of alcohol entirely, while others allow limited exchanges. Because Costco adheres to local regulations, alcohol purchases are often non-returnable—so confirm local rules and consider your purchase carefully.

Cigarettes

Because tobacco sales are regulated by state laws, cigarettes are typically not returnable. This restriction protects public health and complies with local statutes. If you buy tobacco products, assume the sale is final.

Diamonds Over 1 Carat

High-value diamonds, especially those over 1 carat, require verification before a return can be processed. Costco’s return process for large diamonds includes detailed checks to confirm the stone matches the original sale and to prevent fraud. Because of the complexity involved, consider your purchase carefully and request certification and documentation at the time of sale.

Electronics After 90 Days

Most electronics can be returned within 90 days of purchase. After that window closes, returns are usually not accepted. Use the 90-day period to fully test devices and verify compatibility with your systems. Keep receipts and any included accessories in case you need to return within the allowed timeframe.

Tires That Have Been Installed

Installed tires are not returnable due to safety and liability concerns. Once mounted and used on a vehicle, tires can’t be resold as new, so Costco generally won’t accept them back. Confirm tire size, speed rating and compatibility with your vehicle before installation.

Batteries

Used batteries are not accepted for return because their capacity decreases with use and they cannot be resold as new. For hygiene and performance reasons, Costco restricts returns to unused battery products. If you need batteries for a specific device, inspect packaging and expiration dates before buying.

Special Event Tickets

Tickets for special events sold through Costco are generally non-refundable. Events are scheduled for specific dates and seats are limited, so ticket purchases are considered final. Double-check event details, dates and any restrictions before completing the purchase.

Limited Quantity Items

Products marked as “limited quantity” or “clearance” are often final sale and not eligible for return. These items are sold in restricted runs or special promotions and may not be restocked. If a product is marked limited, confirm fit, function and quality before purchasing.

Products with Limited Lifespans

Perishable items and seasonal goods—such as fresh produce, baked goods or seasonal décor—are typically non-returnable. Because these items have limited shelf life or are time-specific, Costco treats them as final sales to ensure safety and freshness for all customers.

Opened Software or Video Games

Once software or video games have been opened, they cannot usually be returned because of piracy and licensing concerns. To avoid buyer’s remorse, check system requirements, compatibility and reviews before breaking sealed packaging.

Prescription Drugs

For health and safety reasons, prescriptions filled at Costco’s pharmacy cannot be returned once dispensed. Medication handling and regulatory requirements make returns impractical and unsafe. Always verify dosage and instructions with the pharmacist before leaving the pharmacy.

Optical Items

Custom prescription glasses and contact lenses are made to individual specifications and are usually final sale. Since these items are tailored to your vision needs, confirm your prescription and fitting details before completing the purchase to ensure proper comfort and vision.

Gift Cards

Gift cards and prepaid cards are treated like cash and are generally non-refundable once purchased. Because they represent stored value, Costco treats these transactions as final. Keep gift card receipts and confirm the amount and terms at the time of purchase.

Seasonal Halloween Costumes

Seasonal costumes, especially Halloween items, are often final sale because they are sold for a limited time and may not be restocked. Try on costumes for size and inspect for defects before purchasing to avoid being stuck with an ill-fitting outfit.

Used Power Tools

Once power tools have been used, they are generally not eligible for return. This prevents items from being borrowed for a project and returned as if unused. Test tools in-store where possible and inspect warranties and return terms before buying.

Understanding these exceptions to Costco’s return policy helps you shop with confidence. When in doubt, ask a Costco associate or check the specific policy details at the time of purchase; rules can vary by location and product type.