On the Today Only page at Scan you can get 2 TB for just over 50 pounds. This is within an inch of the cheapest price I have every seen, and with a respectable dealer and no coupon. This offer is only valid until about 2pm today, but it may come back in a few days. And you can get free shipping via a deal with I think AVforums.
The Deskstar™ 5K3000 hard drive provides an enormous 2TB capacity and features innovative CoolSpin technology to deliver a greater level of power efficiency and quiet operation for energy-conscious, environmentally-friendly computers.
Key to CoolSpin technology is an optimization of motor speed to provide an ideal balance of performance, power utilization and acoustics. The CoolSpin technology, along with other Hitachi power management techniques, gives the Deskstar 5K3000 its 29% power savings over the Deskstar 7K3000.