Just thought the kiddies might want/like this...
i was just using stumble upon (awesome extension for firefox) and i found this.
Apparently you only have to be 13 (minium age) to get one. (you have to have your parent if your 13 - 15) then you have to pay 20 dollars to activate it + how much money you want to put on it the first time. (so if you want to put 20 dollars on it its 40 dollars since 20 activation fee + 20 dollars) then to add more money you can just send them a money order (you can get a money order by just going a store that makes them) and it will be put on your card.
hopefully this will solve the (o noes im to young and i want to buy somethin online issues)