An Olympus point-and-shoot camera. Mine (which is a bit different from the picture above) has a zoom lens and fits into a pocket, so it's a very convenient camera for daily use. However, if you get a camera without a zoom lens, it'll be less fragile, it'll be smaller, and the lens will take better photos. Of course you won't be able to zoom. Cameras like this can be easy to find. I'd start by asking people you know if they have any cameras like this sitting unused that they'd be willing to give you.
A Fujifilm Instax Mini instant camera. Instax Mini film seems to be the cheapest instant film per shot, so you can take more photos without feeling like you're wasting money. The film isn't great. It has a low dynamic range and isn't very sharp. But, the cameras are fun to use, and people seem to like them. It's definitely a fun novelty, but I also don't see myself getting tired of using it any time soon.
A mid '80s Minolta SLR camera. Minolta made various models. The one I have has a built in light meter and can automatically control exposure, or you can do it yourself. Film advances with a thumb-operated lever. It's a nice camera, but it has a lot of plastic in its contruction, so it doesn't feel as durable as older cameras. These cameras can also run into electronic issues.
A Zeiss Contina from the late 1950s. You have to guess how far your subject is and set the focus on the camera to the distance you estimated. It does have a light meter, but you have to set the exposure settings manually. Cameras from this era seem to be very durable. The body is solid metal.
Blue Moon (?)
North Coast Photo
A&I Film Processing
Photo Life NYC (718) 604-0990
Boutique Film LabLabs that process ECN-2 film