Newegg has the WD Caviar Black 640GB 7200RPM Hard Drive for $65 with free shipping.
Specs:
* Brand Name: Western Digital
* Model: WD6401AALS
* Hard Disk Size: 640 GB
* Warranty: 5 years warranty
* Hardware Platform: PC
* Hard Disk Description: Internal hard drive
* Form Factor: 3.5" x 1/3H
* Hard Disk Interface: Serial ATA
* Hard Disk Rotational Speed: 7200
* Buffer Size: 32 MB
* Width: 4 inches
* Depth: 5.8 inches
* Height: 1 inches
* Weight: 1.4 pounds
Newegg.com - Western Digital Caviar Black WD6401AALS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive - Internal Hard Drives
WD Caviar Black 640GB 7200RPM Hard Drive $65 + FS 
