Can use 'security' cams ilo Automotive
I went the really cheap route and bought an outdoor waterproof securty camera. They are cheaper than the automotive ones, but are not hole mounted. I have mine mounted hanging down back under the rear bumper with a 90 degree angled mount. Clicking on the ad above, it looks like the automotive ones are getting much cheaper now.
I bought my camera for around $24 and LCD screen for $79. IF going the 'security' camera/screen route, there are few improtant things to keep in mind:
1. Make sure you get a 12V DC model. Many are 8V or 24V.
2. If using eBay, watch out for shipping charges from Asian sellers. They may have a good price on the camera, but if you then have to spend $29 on shipping and wait a couple months, what are you saving?
3. You will have to cut the 120Vac to 12Vdc transformer off, and put on some kind of connection terminals a automotive lighter plug. IMHO these wires are too thin to just twist together in the field.
Someone asked about install pics. I may take some. I need to remount mine becasue I got rear-ended an it was knocked off. (you should have seen the guy's face furn white when I said, "Oh, that's my rear video camera..." I would swear he didn't start breathing again until I mentioned it was just for backing up and did not actually RECORD. As a rear-ending the accident was obviously his fault, so I don't know what he was so worried about if it was on video tape. It's not like that would make it more his fault or somthing. Such a tape would be fun to watch though.