I installed a wireless backup camera to my 2009 Honda Accord today. I got the VR3 VRBCS300W Wireless Back-Up Camera with 2.5" LCD Monitor from Pep Boys for $69.98 minus a $10 mail-in rebate.
The installation process took just over 30 minutes. Tools required were a scissor, electrical tape, pliers, flathead screwdriver, and phillips screwdriver.
Overall, I'm pleased with the result. I haven't decided where to place the monitor. I can either mount it on the dashboard, air vent, or on the sun visor.
Check out my video and some photos.