Teleskop Express in Germany has a selection. Some are similar to the Stellarvue ones. I believe APM also sell their version of the 2.5 inch and 3 inch focusers.
http://www.teleskop-express.de/shop/..._Focusers.html
Then there is Astro Physics. Their 2.7 inch is heavy but very well made. The weight can actually help balance a heavy objective depends on the scope. I have a second hand one on my 6" D&G.
http://www.astro-physics.com/