RichardPON, i got mine from a company in Ireland called RFconcepts. ordered off there website. when you order, it's worth getting the sunshield, a couple of spare lens covers (particularly if you're going to be mounting it on the bumper), and the different lenses to play around with.

i have mine mounted on the front bumper and it gives amazing pictures. of course you still need something to record with. i use a mini dv camcorder in the glovebox, but as GARETH T says, these days there are good ways of doing it digitally directly, but they're not cheap.