Microscope Forums .com

Hello everyone. I am a freshman at the University of Missouri in Columbia. I am a hobby breeder of gouldian finches, and I need a good microscope to examine fecal samples to make sure my birds are healthy. I don't have a lot of money, so I would prefer a used microscope that's more affordable. Here's what I need:

A binocular microscope with a mechanical stage, a built in light source, a transformer, and preferably 1000x magnification, but at least 400x. I have heard american optics microscopes are good...but I'm open to anything. Please email me at katie@goens.com if you have on available. Thanks!