Micro Center offers the HGST 4TB Deskstar Coolspin 3.5" SATA Internal Hard Drive, model no. 0S03359, for $129.99 plus $5.99 for shipping. (Free in-store pickup is also available.) That's $19 under our March mention and the lowest total price we've seen. (It's a current low of $24.) It spins at 5400rpm and features a media transfer rate of up to 6Gb/s.