first see if any of the big shipping comps will send you packages. if one of them does set up a shipping account. look online to see if you can set up a paypal account. if you can open up a checking account and link just that one to paypal and then when you want to buy an item move monies from your main checking account to the paypal one. if something happens to the paypal account the only have to close the one checking account and not screw up your main checking account. also link a pre paid visa or master card to the account. (use the same pre paid card to buy stuff on the internet).
look online see if there any local computer parts sellers. if there big sellers in your country they will have dealer accounts with big computer parts...