Binetz4, £650 (about $1,000) over here is a good price - I haven't seen any much cheaper unless you're willing to drive to Germany and get one of the few still in stock as new over there... And even then, they are in less common colours like merlot red and would probably need painted. The prices go up nearer winter but unless anyone disagrees I think £900 is pretty much the highest they go for.
It doesn't need 'installed' as such - just a 2 person job to lift it on and off, takes all of 5mins I believe. Ranski has a BMW with in his garage positioned so he can just drop it on.