–Costco American Express: No annual fee for Costco members. Get 3% cash back on gas purchases. Get 2% cash back on purchase at restaurants, airlines, hotels/lodging, car rentals, cruises, travel agencies, and tour operators. Get 1% cash back everywhere else. 0% interest on all purchases for 6 months. Includes American Express’ excellent purchase protection, extended warranty, and online dispute resolution. You do not have to carry your Costco membership card with you if you have your Costco American Express card on you.