GMA Grading has a free tool to help you find out what your cards are worth . This free card price guide will be available to all of our customers in the upcoming days. We are due to launch the search feature on October 31st. This free onlince price guide can help you find the value of your favorite baseball cards, football cards, hockey cards and basketball cards. You can even use the search feature to find out how many cards have recently sold online to help you get a better idea of how much it will sell for.