You can find these old digital microscopes on eBay for under $20. Here’s a blog that catalogs some of what you can see with them – “Last week, I got myself a toy I’ve wanted to play with for many years — the Intel Play QX3 Digital Microscope. When I was a kid, the old medical microscope my parents bought for me at a garage sale was my favorite toy. I would spend hours putting whatever I could find underneath it… and now, with the digital microscope, I’m doing it again as an adult. I am adding new pictures every day and will continue to do so until I run out of things to look at with the microscope”… [via] Link.