mwave offers the Western Digital Caviar Green 3TB Serial ATA 3Gb/s 3.5" Internal Hard Drive, model no. WD30EZRS, for $129.95 with free shipping ($0.04/GB). That's tied with our mention from last summer (which included a HBA card), and the lowest total price we've seen. (It's a current low by $101.) This drive claims to consume up to 40% less energy than standard drives.