Andy
I agree, you get what you pay for.
To save a few bucks, you can purchase used. We have discussed this in previous threads.
We also agree on an external camera. I believe that a trinocular scope (A scope with a camera mount) is the best way to mount an external camera but these get pricy.
Ebay is a good place for used if you know what you are looking for. Usually, the worst problem is that the scopes have been in a cabinet in some university and are dusty and dirty. A careful cleaning and some are like new.
If you do not know about scopes, perhaps the new route. Then andy is 100% correct. Quality is almost directly proportional to cost. Nikon, Olympus and the German scopes are the best
IMO and well worth the money.
Used, the above plus AO, B&L and a few other older scopes.
A wealth of pointers can be found here:
http://www.microscopy-uk.org.uk/index.htmlJohn
"The exact contrary of what is generally believed is often the truth" Jean De La Bruyère (1645-1696)