Thought this was worth mentioning as they're explicitly refurbished (not claimed new), backed by a written 90 day warranty, no question returns and exchanges until 31 Jan 2018, and the price is quite a bit better than a certain ebay seller as well.
Refurbished: HGST Ultrastar 7K4000 HUS724030ALE641 (0F17731) 3TB 64MB Cache 7200 RPM SATA III 6.0Gb/s 3.5" Enterprise Internal Hard Drive - OEM – NeweggFlash.com
Refurbished: HGST Ultrastar 7K4000 HUS724030ALE641 (0F17731) 3TB 64MB Cache 7200 RPM SATA III 6.0Gb/s 3.5" Enterprise Internal Hard Drive - OEM – NeweggFlash.com