Amazon offers the Western Digital Caviar Green 3TB Serial ATA 6Gb/s 3.5" Internal Hard Drive, model no. WD30EZRX, for $89.99 with free shipping. That's the lowest total price we could find by $7, although it was $15 less two weeks ago. This drive is purportedly cooler, quieter, and consumes up to 40% less energy than standard mechanical drives. It features a 64MB cache.