Most of us carry a camera every day in the form of our cell phones and keep a digital point-and-shoot around for special occasions. But the charm of film endures—in particular, people are willing to pay for Polaroid cameras. The most sought after types are the Model 100 from the early '60s, the SX-70 and the Spectra series. An SX-70 in decent condition sells for around $100, but a carefully preserved one can be worth up to $500. You can sell less-popular versions in good condition for $20 to $50. If you've long since given away your camera, but you find a few packs of instant film stashed in a drawer, don't toss them. They go for around $10 each.