Hi Carl
Look here:
http://www.teleskop-express.de/shop/...-only-31m.html - I'm using one of these including their 2.5" FF (I still have the HoTech I started with) and it's very versatile; allowing me to use them on both my SW BD 120mm, SW Equinox 80mm ED as well as the TS Photoline 80mm Triplet - can't complain when you can use the same kit for all three OTAs!
Just browse and check the specs for other models too:
http://www.teleskop-express.de/shop/index.php/cat/c66_Astro-Imaging----Guiding--Guidescopes.html
HTH
Cheers
Bill