Western Digital offers offers the Western Digital VelociRaptor 300GB 10k Serial ATA 3Gb/s Internal Hard Drive, model no. WD3000GLFSRTL, for $129.99. With free shipping, that's $0.43/GB and the lowest total price we could find by $31, although we saw it for $30 less last winter (since expired). It's actually 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 16MB cache.