just FYI for a lot of people, as I have been rigorously searching for a rear view camera.
1) the camera is VERY WELL sought after - when you see one, its gone the next day.
2) the camera is universal (except for the mount). the 370z, Murano, Maxima, Altima(?), GTR, G37 , FXxx, etc, all have the same cameras and CCU units and plugs.
so if you find one from any of those (must be new years 08+ for the most part, some are 09+), then it will plug and play on your 370z and NAV unit, just buy the rear-mount from the dealership.
I have found a entire nissan murano NAV unit for sale w/ the camera on ebay for 150 bucks (Re-sell the NAV unit but keep the camera, still a lot, LOT, cheaper than buying new). I didnt buy it because they didnt include the CCU unit required for the "lines" to show.