Whenever I go to estate sales, unless I'm there for something specific, the main things I'm looking for are tools, records/78s, old tube audio gear, and old camera gear. Most of the time they don't have more than a smattering of plastic compact film and digital cameras, maybe a couple of Kodak Brownies or Polaroid pack film cameras. I'm really only interested in something I can use in the limited (and sporadic) film shooting that I do.
This week I lucked out with this neat Canon rangefinder.