Hehehe, I thought your son was like a grade schooler which is why you were trying to help him out. Honestly at his age, he should ba able to find out through his own friends where he can get ahold of some cards. If all he wants to do is just play here and there, there's nothing wrong with sharing his friends' cards for the duration of the game or if his friends are willing, to let him borrow for a period of time (take home in his posession). It's if your son wants to get back into collecting his own set of cards to use for long term playing (or forever) that he'd need to purchase some. And it's not a cheap hobby at all when you start buying the sealed booster packs trying to get the "good" cards.