TigerDirect offers the Western Digital Red 3TB Serial ATA 6Gb/s Internal Hard Drive, model no. WD30EFRX, for $169.99. This $30 mail-in rebate drops it to $139.99. With free shipping, that's $0.05/GB and the lowest total price we could find by $10, although we saw it for $2 less a month ago. This internal hard drive is optimized for use in 1- to 5-bay NAS systems and features a 64MB cache. Rebate ends December 16.