Do you want a wired or wireless camera? I spent about $40 for a 4.5" tft monitor, camera and RCA extension cable from Amazon and eBay for my wired set up and get good results. The camera isn't the greatest at night but you get what you pay for.
2013 26BH ghetto model w/ 4 plain rims and some rust
2001 Silverado 2500HD 6.0 gasser
I have a fever...and the only cure is more camping!