Through Costco Travel, members who are 25 or older can get discounted rates on car rentals. The system is similar to the Costco Auto Program — Costco doesn't rent the cars itself, rather, it partners with a third-party supplier and uses its large membership base as leverage to negotiate discounted prices. The retailer's car rental program allows members to reserve vehicles from participating Alamo, Avis, Budget, and Enterprise locations.

Members can reserve a rental through the Costco Travel website or by calling 1-866-921-7925.

Here's how Costco's car rental program works.

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