Seagate 640GB 5400 RPM 8MB Cache 2.5″ SATA 3.0Gb/s Notebook Hard Drive $49.99

NewEgg.com has a Seagate Momentus 5400 ST9640320AS 640GB 5400 RPM 8MB Cache 2.5″ SATA 3.0Gb/s Internal Notebook Hard Drive for $49.99 with Free Shipping.