Planning ahead, I've been trying to find a way to pay for my upcoming monthly subscription fee for FFXIV through the means of cash.
I do not want to use a debit/credit card/paying online for personal reasons. Usually I would by a game card from Gamestop to pay for subscriptions on games, but I am not sure they will sell any sort of that. Basically, I do not want to give out any of my personal information out there. Not even a street address.

As a means of paying online, I was looking for a way to buy say, an Amazon gift card and using the gift card balance to pay for it. But I have not found an option of that sort yet. Any other possible methods? Suggestions?