Well, I want to become a member, but my parents won't allow me to use their credit card. However, I have found out there is something called a Visa prepaid card, which you buy just like a gift card, basically, and you can use it as a regular credit card until you have run out of money. I was wodering if this method would work with RS? And if no one knows, is there a way for me to contact jagex about this question?

Like the kind you get at Wal-Mart or a conveinence store? I've heard of those being used before. Just remember to repay when you need to.

Yes I believe those work. Just look at Jagex's membership payment options and you should find that they're one of the options.