If I am working in an environment where my camera is likely to get lost, stolen, or damaged, I use an inexpensive Nikon N70/F70.
When I need to loan a camera, I loan a Nikon L35 AF.
In the past, I have used a Nikon EM and a Pentax Asahi Spotmatic as my expendable cameras. With the Spotmatic, I only had one lens – a 50mm f/1.4. With the Nikon N70 or EM, which lens or lenses I used depended on what I was shooting. For general shooting, I used a Sigma 35-70mm f/3.5 – f/4 zoom instead of my more expensive Nikon 35-70mm f/2.8.