Western Digital Scorpio Blue 640GB 5400 RPM 2.5″ SATA 3.0Gb/s Hard Drive $49.99

Newegg.com has a Western Digital Scorpio Blue WD6400BEVT 640GB 5400 RPM 8MB Cache 2.5″ SATA 3.0Gb/s Internal Notebook Hard Drive for $49.99 plus $0.99 Shipping.