Niceol via eBay offers the 1,000x 2-Megapixel USB Digital Microscope for $15.76 plus 69 cents for shipping. Excluding other eBay vendors, that's the lowest total price we could find for such a model by $5, although we saw it for a buck less a week ago. It supports 50x to 1,000x magnification and USB so you can view the output on a computer monitor.

Note: It ships from China and may take up to four weeks for delivery.