my goodness I wish I waited for this, I bought two from ewiz couple of weeks ago for more.
Mwave has
WESTERN DIGITAL WD5000AAKS Caviar Blue 500GB 7200 RPM 16MB cache SATA 3.0Gb/s 3.5" internal hard drive (Bare Drive) for $40 + FS for mclub members (you can join for free)
if you have or get review coupon you get it for $35 + FS ( Cheapest I remeber for this great drive)
Technical Information:
Hard Drive
Form Factor: 3.5" x 1/3H
Capacity: 500 GB
Interface Type: Serial ATA-300
Buffer Size: 16 MB
Features: Data Lifeguard, Shock Guard, IntelliSeek, Preemptive
Wear Leveling (PWL)
Compliant Standards: S.M.A.R.T.
Performance
Drive Transfer Rate: 300 MBps (external)
Seek Time: 8.9 ms (average)
Track-to-Track Seek Time: 2 ms
Average Latency: 4.2 ms
Spindle Speed: 7200 rpm
Reliability
Non-Recoverable Errors: 1 per 10^15
Start / Stop Cycles: 50,000
Expansion / Connectivity
Interfaces: 1 x Serial ATA-300 - 7 pin Serial ATA
Compatible Bays: 1 x internal - 3.5" x 1/3H
Miscellaneous
Works with Windows Vista:
Software and devices that carry the Works with Windows Vista logo
have been tested for baseline compatibility with PC's running.
Compliant Standards: RoHS
Environmental Parameters
Min Operating Temperature: 32 °F
Max Operating Temperature: 140 °F
Humidity Range Operating: 5 - 95%
Shock Tolerance: 65 g @ 2ms (operating) / 350 g @ 2ms (non-operating)
Vibration Tolerance: 0.75 g @ 20-300 Hz (operating) / 3 g @ 10-300 Hz (non-operating)
Sound Emission: 28 dBA
WD WD5000AAKS Caviar Blue 500GB 7200 RPM 16MB SATA 3.0Gb/s Bare HD $40 or $35 + FS 
