got about 1000 in my wheels, i had to buy 2 sets as i wanted the 8" all round, then i had a expensive refurb on them, polished the centre caps myself and hand painted the metal porche badges, which were quite hard to remove from the caps, the metal caps cost a fortune at the dealer (about £150) but they go on the bay for about 40 to 50 quid a set, although usually tatty.. iv got a spare set polished up just like the ones on my car but im hanging on to them.
the adapters to make them fit are quite expensive too so bear that in mind (about 250 quid for good ones)