Not exactly the definition of "toy," but I recently purchased an Agfa Clack that I found on Craigslist for a few bucks and put into good working condition in an hour or so of tinkering with a decades-dry shutter. I've run a couple of test rolls through it and will know how good/bad the images look when I get into the darkroom.
I like it so much I found another cheap Clack deal on e-Bay and am awaiting its arrival. I plan to covert it to a pinhole camera. These are pretty ideal for a quick Frankencamera adaptation.