Discount Gift Cards: Sell or Buy a Discounted Gift Card - GiftCardGranny.com. Discounted Gift Cards for Hundreds of Merchants - GiftCards.com. GiftCardRescue – Buy Gift Cards, Sell, Swap, Online, Gift Card Exchange. Gift Card Exchange - Buy, Sell, and Trade Gift Cards Online | Cardpool. DISCOUNT GIFT CARDS EXCHANGE - Save UP To 30% On All Major Retailers.