Bought the camera through ebay -

BMW 3 5 X5 X6 Series E46 Car Rear View Camera: eBay Motors (item 150472998891 end time Oct-26-10 00:21:08 PDT)

and installed it myself. Took me a day to run the wires through the tailgate and ceiling but it's all worth it. Now I'm confident when I back up. I have kids running around the house all the time.

Here's how it looks...







Hope this helps. Cheers!