Costco and Amazon sell Costco gift cards on their websites. Amazon.com features third party sellers who impose a fee and shipping and handling for Costco gift cards that have no stored value or pre-designated amounts.
Costco gift cards, also referred to as Costco cash cards, are refillable and have no expiration date. A customer must have a Costco membership in order to purchase and reload a Costco gift card online at Costco.com. However, Costco members are free to distribute Costco gift cards to non-members.
Amazon.com third-party sellers of Costco cards typically purchase and reload the cards themselves and then sell them to any interested parties. These sales and the customers who make them are protected by Amazon's A-to-z Guarantee.