My wife just found some info on a simple camera kit from a Japanese site.
It's in the neighborhood of $200. I'll report back with better info as we collect it.
I hope to do one in my car. I already have park assist, so dont really need it, but it's a nice feature that I feel all these cars should have already.....
Gives us hope that there are cheaper solutions.
I'm going to look into this further and report back when I can.