
Went to Holden Quoted $550 for genuine plus $130 programming.
Still Cheaper than the JHP kit.

http://www.jhp.com.au/holdenve/Rearcamerasensors.htm
The sedan on the other hand is $120(ish) from Holden

and I'm failing in the wreckers department too can't find a wagon let alone one with a camera

The difference between the two is the wagon comes with the rego lights and boot release so you don't have to cut the grommet.
After a bit of mucking around at Holden comparing parts the sedan mounting holes are different and so is the plug but both have more than 4 cables running to the plug ie power +/- and video +/-
