Amazon with URVOLAX-US has the URVOLAX 11'' Dash Cam Mirror w/ Front & Rear Cameras + GPS module and 32GB memory card for $200 - $80 off with coupon code 40E13HHW in cart = $120 with free shipping.

The includes GPS module adds driving speed / location data to videos. Backup camera has a 49-foot cable for longer vehicles / attached trailers.