You can probably find a Voigtlander Bessa I with a decent lens and shutter in the $100 range. No rangefinder, but there were separate rangefinders made that fit into the flash shoe. I have one for my Bessa I, and it's a pretty good combination. Given that it really is "6x9 in a coat pocket", it's a pretty amazing system. The negatives aren't up to the quality of something like a modern SLR, but if you shield the lens well and make sure you're avoiding camera movement (fast shutter speed or tripod) you can get some pretty great results from a camera like this.
I love old folders...wish I had more time to shoot with mine.