I bought one off of amazon that hooks up to the computer, so you do all of the viewing on the screen. For some reason, the green one was on sale for $18, while the other colors were still normal price. I think they were under $50 to begin with. It got decent reviews, so I bought it. We haven't tried it yet because I'm giving it to the dc for Christmas. I figured for $18 it was definitely worth a try! This was a couple of months ago, so I don't know if they are still on sale or not.
It's a Zorb 35X digital microscope.
ETA: I just checked and the green one is back up to around $40. I don't know if you are wanting something like this or a more traditional microscope, but I wanted to mention it.
