Hey man! I had to find a workaround for this since I'm outside the US. There's a method similar to PayPal that's called entropay where create a virtual credit card and you can use that card to buy stuff on the PSN.
The only thing is that they charge u 4.95% for every time you reload the credit card, and the minimum amount is 20 bucks, that's a dollar more. But it works, go to:
www.entropay.com







