aside from the info I already mentioned in your other shopping/shipping thread, you can look into shopusa
The company has a US delivery address near one of the cargo ship ports. You have your items sent there and shopUSA takes care of importing it and all the duties. I used it once and was very disappointed with their customer service but they're still around so I guess others are happy with it.
The way I get stuff is by arranging my purchases around my trips out of the country. Fortunately I travel regularly enough, or have enough friends or colleagues who travel and are willing to bring items.