ZipZoomfly.com has the Hitachi Travelstar 5K500.B 500GB Serial ATA 3Gb/s 2.5″ Internal Notebook Hard Drive, model no. 0A57915, for $74.99 (89.99 – 15 MIR) with Free Shipping for a limited time. The $15 mail-in rebate is good until November 10, 2009. This drive runs at 5400 rpm and features an 8MB cache.