There wasn't as of a few years ago. I inquired about placing an order of a dozen dual exhausts and None sent me forms for becoming a dealer. They required you to buy in to the entire line, with a significant dollar amount. Well above what I was able or willing to commit to. Much of their line is dirt bike exhausts, which I really didn't think would sell at their retail pricing, in the US, considering the competition.
They show a single dealer in the lower 48 in TN, one in MX and one in Canada, with a final North American distributor in Alaska on their web site now. http://www.noneracing.com/en/wholesalers/
@Heyder - I suspect not. None only shows the 2012 model year supported.