James,

I have been checking on backup (and now side) cameras for over a year.

A lot of changes/advances are taking place, especially with respect to multiple cameras, the "read-out"/viewing device, and with lowering costs.

I will not be buying anything for a year or two, but now a license-plate frame w/built-in camera looks good.
- the viewing device might be a GPS unit (the larger the screen the larger the $$)
- the connection of the camera to a viewing device is another issue - Wi-Fi or fiber-optic line/cable

If you find something interesting, please let us know.