My local dick smiths has them for sale for $499 and I think they do online (not sure sorry). A seller on eBay is selling them from New south whales for $299 with free postage, pretty good deal I reckon.
Dick Smith and JBHiFi usually have them for 499, some EB Games stores have them aswell. If you need it cheaper check ebay or wait for a sale.
Or you could trade some things into JB or EB games to bring down the price.
