Sell Martin MotorSports gift cards with the GCX gift card exchange. Depending on the popularity of your brand, we recommend you discount Martin MotorSports gift cards at least 10% off, but ultimately you control the selling price! If your gift card can be used to shop online at Martin MotorSports, GCX has already checked the e-gift card box below. Please fill out the rest of the listing form to sell your unused gift cards.