With the amount of counterfeit memory cards available, I try to buy all my memory from a reputable online source like newegg or frys. For the amount of savings, it's not worth the suspicion of fake and hassle of return to a vendor on ebay if it is fake. After all, I'm already not spending money on the games. I figure I'm a cheap bastard, but I'm not going to cheap myself into getting ripped off.