Newegg has the Fujitsu HandyDrive MMH2500UB 500GB USB 5400RPM Portable Hard Drive for $85 with free shipping.
Features:
With up to 500GB capacity, backup or easily carry office files, MP3s, videos and photos
Powered from host computer no need for an AC adapter
USB 2.0 interface
Power saving features
Security and backup software bundle included
Three-year Limited Warranty and technical support
Newegg.com - Fujitsu HandyDrive MMH2500UB 500GB 5400 RPM USB 2.0 External Hard Drive - External Hard Drives