That is true, I ahve seen a fair few online retailers who wont sell outside US. Ebay is the only way you can get them here that I have found.
I emailed Bandai and they said they were doing a world-wide rollout of the toys over the next 6-12 months. Perhaps they wanted to test the popularity of the line before investing the amounts of $$ required to send them locally. Or perhaps they had limited quantities and wanted to give the US the most (or all) of the stock.