As one of its daily deals, Newegg offers the refurbished HGST Ultrastar A7K2000 2TB Serial ATA 3Gb/s 3.5" Internal Hard Drive 4-Pack, model no. HUA722020ALA331, for $179.99 with free shipping. That's $45 per drive and $60 under the lowest total price we could find for four new units. Each drive runs at 7200 rpm and features a 32MB cache. Deal ends today.
A 90-day warranty applies, but it is unclear who backs it.