newegg offers the Western Digital VelociRaptor 600GB Serial ATA 6Gb/s Internal Hard Drive, model no. WD6000HLHX, for $99.99 with free shipping ($0.17/GB). That's the lowest total price we could find by $50. This is a 2.5" drive encased in a larger heatsink that fits into a standard 3.5" drive bay. It operates at 10,000 rpm and features a 32MB cache.