I have a 2006 X5 3d with OEM screen, TV, & Sat Nav.

whats the easiest way to install a reverse camera to this car (besides factory setup)?
Whats the best way to remove the lock on the TV display whilst moving?

I have seen a lead which enables me to do the above but i find it hard to believe the cost of just a couple of wires.

Is there any easier and cheaper way????

thanks in advance