I got my 17x8.5 and 17x9.5 Jap wheels new for $1500/set after agent fee (from Yahoo Auctions), delivery, customs duty and tax.
Auction price was a tad under 70,000 yen. (~$900AUD = $225AUD each wheel)
They are Semi-Solid Forged wheels that were made by SSR and rebadged and sold under a different name.
$900/wheel is a bit extreme for 17's? nismo's?