GoHardDrive.com has the White Label 640GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive for $65 - $5 code 5OFF640GB + $0 shipping = $60 shipped. It uses a new 2x320GB platter design. They hint that it is similar to the Western Digital Caviar SE16 WD6400AAKS (which probably means it IS that drive).