Cadillac CTS-V - Back up/ reverse camera?

Is there a kit to install a back up camera in our cars and display it on the screen that's not too expensive? I did a search but came up with nothing.

Any audio shop should be able to do it for you. That's where I would start

Nope. There was someone on the CF a while back (vendor) that hacked the video signal for such an adventure. Unfortunately he wanted something like $800 to add the AUX in to your HU. If you get a line for something MUCH more reasonably I would be down 100%