Even cheaper than they were 3 weeks ago:
Western Digital Caviar 1TB SATAII 64MB Cache 3.5-inch Green Internal Hard Drive OEM
As hard drive capacities increase, the power required to run those drives increases as well. WD Caviar Green drives make it possible for energy-conscious customers to build systems with higher capacities and the right balance of system performance, ensured reliability, and energy conservation.
Shock Tolerance:65 g @ 2ms (operating) / 300 g @ 1ms (non-operating), Max Operating Temperature:60 C, Min Operating Temperature:0 C, Compatible Bays:1 x internal - 3.5" x 1/3H, Interfaces:1 x Serial ATA-300 - 7 pin Serial ATA, Weight:0.6 kg, Depth:14.7 cm, Width:10.2 cm, Device Type:Hard drive - internal, Height:2.5 cm, Capacity:1 TB, Compliant Standards:S.M.A.R.T., Features:Native Command Queuing (NCQ), IntelliSeek, StableTrac, Perpendicular Magnetic Recording (PMR), IntelliPower, NoTouch ramp load technology, GreenPower technology, Form Factor:3.5" x 1/3H, Buffer Size:64 MB, Interface Type:Serial ATA-300, Service & Support:3 years warranty, Service & Support Details:Limited warranty - 3 years, Compliant Standards:RoHS, Drive Transfer Rate:300 MBps (external), Internal Data Rate:111 MBps, Start / Stop Cycles:300,000, Non-Recoverable Errors:1 per 10^15
P.S. Apologies if re-summit, couldn't find in the search
Proper price is £42.99