Had the same problem trying to get some Rizoma bar end mirrors. I gave up hope of getting them in the states so I tried
Carpimoto in Italy. I am always leery about ordering over internet internationally but I was pleasantly surprised when I got them in less than a week. Language wasn't a problem, every email was in Italian and English. It seems Rizoma keeps the locals in Italy well stocked with the US and UK being last priority. The price of the mirrors plus shipping was about the same as the price of the mirrors alone from anyone else. So it was a win-win situation.