Meritline offers the Hitachi Travelstar Z5K500 2.5" 320GB Serial ATA 3Gb/s Internal Notebook Hard Drive, model no. 0J11283, for $51.99. Coupon code "MLC9W14SN" drops it to $42. With free shipping, that's $0.13/GB and the lowest total price we could find by $16. This drive runs at 5400 rpm and features an 8MB cache. Coupon expires after 100 uses.