Newegg offers the OEM Western Digital Red 3TB 3.5" NAS Serial ATA 6Gb/s Internal Hard Drive, model no. WD30EFRX, for $112. Coupon code "ESCXPA22" cuts that to $104.99. With free shipping, that's the lowest total price we could find by $7, although we saw it for $15 less in June. This 5400 rpm hard drive features a 64MB cache.