although they do pop up on here for £100 every so often. then you need to buy the unlock license for £50. when you buy these you get a discount on the maps which brings the £43 maps down to £23.
what most tend to do is buy the rstuner for £100, buy the unlock license from the fastchip website along with the maps, map the car then sell the rstuner for £100, effectively mapping your car for £73. it's worth it.