Stephen Lewis , Mar 29, 2010; 05:25 p.m.
You need to make some decisions before we can give you honest answers which would be meaningful. Take a look at www.KEH.com in their used gear dept. and see what appeals to you. You say you haven't decided whether you want rangefinder or SLR cameras. You haven't said if you want 35mm or medium format cameras (folders), or some intermediate sizes. Do a Photo.net search for several postings by Gene M, who specializes in taking used cameras of all sorts and running film thru them...perhaps something in one of his posts will catch your eye.
Not sure where you live, but where I live, within 10 miles are several thrift stores and virtually all of them sell used film cameras, often costing as little as $3-4 in working condition. I've even picked up a Nikon EM with a perfect 50mm lens on it for as little as $8 this way. Most of these cameras are 35mm point & shoot cameras but some are excellent picture takers with good sharp lenses and reasonable zoom ranges, but occasionally a folder shows up. Another venue you might try is garage sales.
The biggest obstacle is that you haven't narrowed down your focus to what you're really looking for..sort of me saying I'd like a vehicle, but don't know if I'm looking for a bicycle, car, van, truck or Segway. Perhaps some reading on your own would help you come to a better understanding of what you want.