Not one for all but here goes...
Got to the Dell website and customize a Dell streak with the home av kit at 479. Under the Streak Tablet Solutions change the home av kit for the car kit to get 459. It doesn't work with no accessory kit at all. Unlocked to all uk networks.
Also quidco but which would pay out? It's between three and ten percent.
I think it would be the six percent so that gets it down to 432 (possible 413 if it tracks at ten percent)