TigerDirect offers the Western Digital Caviar Blue 500GB Serial ATA 6Gb/s 3.5" Internal Hard Drive, model no. WD5000AAKX, for $59.99. These mail-in rebates of $10 and $10 cut it to $39.99. With free shipping that's $0.08/GB, $10 under our November mention of an OEM unit, and the lowest total price we could find by $20. This drive runs at 7200 rpm and features a 16MB cache. Deal ends January 4.