If it is truly blocked, period, even with crysta etc. Then you could have him paypal you money, and buy him a visa prepaid debit card in the states with said money on it. Then tell him the numbers off the prepaid card.

Optionally they can use a VPN (Virtual Private Network) to make it look like his internet traffick is coming from the states, then he/she should be able to get on the website as if they were an American and use the us version of paypal.

E.g. BattlePing