Non-members may use the cash cards to shop at any Costco location in the US, Canada, Puerto Rico and online at Costco.com or on Costco.ca 

The card can be used as a free pass for you to shop at any Costco location without paying for the Membership just show the card at the entrance, and you will be allowed to enter.

 
The Costco Cash card features include: 

• A convenient payment option in warehouses, gas stations, and costco.com
• No expiration date
• Are rechargeable at any Costco warehouse location
• A supply card or gas card for businesses
• A means to provide students with money for food, gas, or school and dormitory necessities, while being able to limit their spending
• Balance can be accessed on costco.com, the warehouse "red kiosk" or by calling the toll-free number on the back of the card