Thanks for replying!

Problem with gametime cards is that they only have 60 day versions. I avoid them nowadays since I wasted quite a bit of gametime in WoW because I'd get bored after a month, then I'd force myself to log on just so that I don't feel my sub is going to waste lol. Ah well, if there's no 30 day option, I could always cancel the sub before it renews, I guess.