Apple today released a brand new Updates Mac Mini, however if your looking for the old model Next Byte have them sale for just $699 for the Mac Mini 2.0GHz/1GB/120GB/SD or $849 for Mac Mini 2.0GHz/2GB/320GB/SD.
Be quick there is only 29 of them. http://www.nextbyte.com.au/pages/bestbuys.aspx