This Buick Terraza head unit audio rear view camera is cheap now,you can buy it at http://www.seicane.com/buick-terraza-dvd-player-gps-navigation-system-with-radio-tv-bluetooth-srd-8724-2 .you will get 21%OFF ,Buick Terraza head unit supports Built-in GPS navigation system with audio system,this product fits 2005 2006 2007 Buick Terraza,it supports rear camera input.automatically switching to rear camera when revese the car,it is easy!