I know the post is fairly old but i thougt to add some detials to the thread.
Regarding PayPal account, im afraid it is not possible from Pakistan. I have PayPal account in Germany and even if i try to use it outside of Germany, it can only receive money and outgoing is blocked as the keep track of ur source IP's.
Also, in order to open up a PayPal account you need to add your Bank Account detials which they verify by sending you small amount which later you verifiy to create your account.
@PUNK, Im sure you must already have bought it now but if not then my honest opinion to you is to find someone who is coming from US to Pakistan as im sure there is a major Pakistani Population that resides there. Better get a credit card, go to online store and have it deliverd to someone whom you know personally. Later, that guy himself or if he knows someone can forward ur stuff who can bring it back to Pakistan duty free (Unless you have some hugge requirement like wheels, Tires etc...)