recommendations for a cheap, decent backup camera?

I also got a $50 camera 4 years ago from Amazon or E bay. It is a Pyle (brand name) it has served me very well the last 4 years. I wired it so I can turn it on when I want it on. I tow a boat that I otherwise can't see. Works great for backing up the boat or into spots. The monitor is small, about 3 X 5 but works better than expected. I have been pleased and when this one buys into it, I'll get another.

Brian