If you happen to find a gift card under the tree tomorrow and can’t use it, never fear. You don’t have to let a gift card waste away. Mark your calendars for Gift Card Exchange Day on Saturday, December 26. Sponsored by GiftCardGranny.com, the event helps those with unwanted gift cards find the best price from a number of gift card resellers. If you’ve never “exchanged” a gift card, Gift Card Exchange Day makes it easy. All that’s required is the merchant name and gift card amount, and offers from companies that want to buy your card will be instantly generated. Nearly any unwanted gift card can find a home and you can pocket some cash.