(Bill, how did I know it would be you and I answering this??)
In our labs, we use Olympus binocular scopes with Nikon cameras - I have used Olympus, Nikon, and Zeiss scopes - it's really the glass that makes the difference on the scope, just like on a camera. Do you have any idea what magnification(s) you'll require?
It may also be worth contacting some of the optical service guys local to you - I used this kind of connection to get a line on a personal scope (lightly used, from a lab - you can generally get detailed info on it from the service guy/gal) in the past. Yes, I am that kind of nerd - with a microscope at home and in the market for a second one! I do have a contact out here in So Cal, let me know if you'd like their info - I can PM it to you.
Best -
Allison
I think we buy our used scopes from the same guys. But I think your definition of "lightly used" is probably a bit different than ours. We bought one lightly used scope from our local Zeiss scope guy that clearly had been used with lots and lots of preserved samples it still smelled like formalin and the paint was missing in a bunch of places, but the optics were OK. Now thankfully we can actually buy new ones.
Bill