International credit card. If you don't have one, chances are someone close to you does and is willing to buy it for you as long as you pay them when they are billed. And like I said, be prepared to be stabbed in the back by the customs, who have no idea what a PowerPak is but think they can get your money anyway!
Yeah, I meant using the credit card with PayPal all along. I don't think there is any other method for sending money to PayPal from Brazil other than with an international credit card.