http://www.baileys-online.com/store/USA.htm
Found this one on Baileys for $69.95 US. But there is one made by Stihl I've been told that's higher priced than that; but, its specifically for chainsaws and is wireless. The one on Bailey's is not wireless and has a max rpm of 16,000. The extra $30 bucks of the Stihl wireless sounds like a better deal to me.