Nintendo will trigger another round of obsessive capturing, training, and fighting when they release Pokemon X/Y for the 3DS on Oct. 12. But you can also collect them in the real-world too, of course, courtesy the long-running card game. Since its debut nearly two decades ago, some 15 billion Pokemon cards have been printed. Almost all are worth very little, but a precious few can sell for hundreds, thousands, or even tens of thousands of dollars. Could you be sitting on a stash of Pokemoney? Read on to find out.