Yeah, that might be right for genuine's. Two suggestions, have a look on EBAY, sellers in the US selling for around $500 US (probably replica) Unfortunately freight is hefty.
Also, I have priced replica 10 slot 18" M3 wheels from Mr Mag here in Perth at $1600 a set!! Falken Tyres at $250 = $2600 on the car. They look absolutely spot on. If u check out unique car magazine they have ads in there for replica BMW, Merc, Audi wheels etc via a distributer in the Eastern States.