I was told that while Trijicon is listed as exportable, companies in the us are not allowed as per some sort of agreement. Don't know how true that is. I ran into this problem a year ago when I wanted a TrijiDot for my 870. Took forever to get someone in Canada to import it for me.
I don't know how well it would sell here as I seem to be the only person interested in the TrijiDot, but I can tell you its a great product. Trijicon puts out great products, anyone considering a TrijiDot for their shotgun. Go for it if you can get your hands on it!