I used to collect 35 mm cameras. I stopped using them a few years ago, when you could still drop film off at the 1 hour processors. I sold a lot of them for much more than I paid, but I still have quit a few. Here is a small sampling:
This Kowa SeT was one of the few leaf shutter SLR cameras. The 50 mm lens is fixed. Since the shutter is in front of the mirror, the mechanical sequence to take a picture is quite complicated. First, the shutter closes, then the mirror lifts up, the aperture closes down to the f stop, the shutter opens to take the picture, then closes, the aperture opens back up, the mirror drops, finally the shutter reopens. All in as little as 1/500th of a second.
Kowa SeT from the 1960s
I found this old Minolta at a local thrift store for a small sum. I have not put film in it, but it appears to be fully functional. I had to replace the view mirror due to loss of silver on the original.
1937 Minolta TLR
I go this one to replace the first 35 mm camera I ever used. It is an early 1950s Voigtlander Vito II. It is actually a good camera for carrying on the bike, due to its compact size when folded. It could fit in a jersey pocket.
1950s Voigtlander Vito II