I am wanting to buy minecraft alpha/beta for quite a while now. I am wondering if visa prepaid cards that I see at wal-mart would work. One main question I have is, can I buy them if I'm only 12 years old? I know how to use them and all. But can you guys recommend me one that doesn't have interest fees, time limits, and stuff like that? Like extra charges. Say If I was going to put 20$ on the card. Thanks for all the feedback I can get. Tell me the card name, and the stores I can find them in.