lol they suck , don't even bother , because I work as a cashier, lemme explain a few of the problems I got with those.
Okay say for example your order is like 63.99 or something a game with tax. your card only has 25 dollars, it will keep denying your card because it wants to pay for the whole thing. You can enter in the register EXACTLY how much you wanna pay, like just 25 ,and pay the rest. but if you dont know , you can guess but after a few tries, your card gets locked out .
lol You can call em to find exact amount, but you wait for ever. BUT im not saying this WILL happen, but be warned its not fun. I'd prefer the cash - it can be spent anywhere. But its good to have a card for online purchase, but the problem i mentioned before is unfixable. And they never give your money back lol, they fee you to death untill you use all the cash.
LOL but to answer ur question go to like walmart or something they have em pretty much anywhere.