Sell gift cards securely from Discovery Channel Store with Raise's online gift card marketplace. Your Discovery Channel Store gift card will be listed in front of the thousands of buyers perusing our gift card exchange. To sell Discovery Channel Store gift cards quickly, set the price between 2% and 20% off the original amount. The asking price is up to you, but it really depends on the popularity of Discovery Channel Store gift cards. Remember, you can adjust the selling price of your gift card at any time.