There are many different marketplaces where you can buy or sell cards (e.g. eBay, MySlabs, Heritage Auctions, PWCC, Goldin Auctions, etc.). However, we cannot guarantee that you can buy or sell a card for the price shown. Cards derive value from supply and demand, which changes on a daily basis. Our app is intended to provide you with the information you need to form an educated opinion on what a card might be worth, so that you can make an informed decision.