I've used Singapore's Vpost for years to ship stuff Amazon, Ebay or other US based merchants won't ship outside of US - Vpost gives me a virtual US address, my item gets shipped there and Vpost sends it to Singapore (or Malaysia).
VPost only operates in South-east Asia, but there are other companies providing the same service that will ship almost anywhere
Mail Forwarding of American Products for International Delivery
MyUS - US Mail Forwarding, Worldwide Shipping
you'll probably find more on Google...