B&H Photo Video offers the Hitachi GST 4TB Deskstar Coolspin Serial ATA 6Gb/s 3.5" Internal Desktop Hard Drive Kit, model no. 0S03359, for $151.99 with free shipping ($0.04/GB). That's the lowest total price we could find by $35, although we saw it for $13 less via in-store pickup in July. It runs at 5400 rpm and features a 32MB cache.