I decided to buy this $32 USB microscope which claimed up to 800x magnification. I've actually had relatively good experiences with products from DX, once I learned to be patient (after all, 90% of what we buy daily are probably made in China...).
I was actually really impressed with it. It basically functions as a webcam. I have no idea what the drivers on the CD do but works out of the box with VLC, on Linux at least. I haven't done a whole lot other than look at random things laying around, but I took this screenshot of a defrosted fruit fly at max magnification. Not bad if you ask me...!