TigerDirect offers the Western Digital 3TB Red Serial ATA 6Gb/s Internal Hard Drive, model no. WD30EFRX, for $139.99. This $30 mail-in rebate cuts it to $109.99. With around $4 for shipping, that's $0.04/GB and the lowest total price we could find by $19, although we saw it for $25 less last month. It's optimized for use in NAS systems and features a 64MB cache. Rebate expires December 12.