Fry's Electronics offers the Hitachi Deskstar 7K4000 4TB Serial ATA 6Gb/s Internal 3.5" Hard Drive, model no. 0S03355, for $148 with free shipping ($0.04/GB). That's $42 below our August mention and the lowest total price we've seen for any 4TB internal hard drive running at 7200 rpm. (It's a current price low by $27.) It runs at 7200 rpm and features a 64MB cache.
Update: It's now available for in-store pickup only.