paying with pre-paid cards

I wasn't sure to put this here or in tech support. Decided to put it here. My first month is going to run out soon and me no have credit card :P. Has anyone had any luck using pre-paid Visa cards to buy crysta or something like that? Want to get this figured out soon so my playtime isn't interrupted.

Use the 60 day cards they sell in stores? At least in Finland..

Already looked into that. I think they only sell time cards in Europe

Ultimate Game Card can be used to buy crysta. I'm pretty sure prepaid credit cards work as well, but I don't know that for certain.