Dell.com offers 1TB Buffalo MiniStation Stealth USB 2.0 Portable Hard Drive (HD-PCT1TU2-BK) for $80.99 with FREE shipping, after coupon code VZQG7WPT?PJ4C4 applied during checkout. That's the best deal we could find currently.

Why get this and why you need it?
This Buffalo 1TB Portable External Hard Drive is powered by USB 2.0 port directly and no separate power adapter is required for its operation. It comes pre-formatted for Windows & Mac. Includes multi-purpose Buffalo Tools utilities to enhance PC performance by faster file transfer, easy backup and restore, and more. Backed by 1-year warranty.