Gary,
I put "rear view camera" in google and got 200,000 responses. There is every thing out there you could ever want, even underwater setups. Take a look at this sample page.
Here
You will even find a Sony or Pioneer flip up or flip down model or the like at Best Buys, or any of the electronics outlets(of course it doesn't include the camera,just imputs). Saw one in the Sunday circulars for around $600. But there are units with the camera for as low as $399. Some of the camera and monitors are bulky(for big rigs). Some include bullet cameras. There was a post here a while back about a system that would use suction cups to stick the camera to the side of the car or where ever for Hollywood type views. I think I saved that thread. If I can find it this afternoon, I will post it.
Bill