There are quite a few US retailers who will ship many items internationally. I've bought stuff in the past from Astronomics (
http://astronomics.com/main/Telescop...gory_name/Home), Alpine Astronomical (
http://www.alpineastro.com/), Company Seven (
http://www.company7.com/) and B&H (
http://www.bhphotovideo.com/) to name four. However, some manufacturers insist that their US dealers only sell their product lines within the US. When this happens it is usually because the manufacturer has done exclusive deals with several distributors covering different parts of the world, e.g., distributor X has exclusive rights to sell these lines in North America, distributor Y has exclusive rights to sell these lines in Asia/Oceania, etc. Only occasionally is it because the dealer isn't interested in selling outside of the USA.