newegg.com offers the OEM Hitachi Deskstar T7K500 500GB Serial ATA 3Gb/s Serial ATA Internal Hard Drive, model no. HDP725050GLA360, for $54.99 with free shipping. This $10 mail-in rebate cuts it to $44.99 ($0.09/GB). That's $15 under our January mention and $4 less than the lowest total price we could find for a new, factory-sealed unit. It features a 16MB cache and runs at 7200 rpm. Rebate expires June 30.