Amazon has got the Seagate Barracuda 2TB 7200RPM SATA 6Gb/s hard drive (ST2000DM001) on sale for $89.99. It ships free with Super Saver Shipping.
Seagate ST2000DM001 Barracuda 7200RPM 2 TB SATA 6 GB/s NCQ 64 MB Cache 3.5-Inch Internal Bare Drive
Barracuda hard drives from Seagate give you with the Power of One. One terabyte per disc technology. One drive platform for every capacity need and every desktop storage application. One hard drive qualification effort. One hard drive platform to choose from. One hard drive with trusted performance, reliability, and simplicity to deliver the lowest total cost of ownership.