MacMall offers the refurbished LaCie 1TB Rugged Triple USB 3.0 Portable Hard Drive, model no. 301984-R, for $79.99 with free shipping. That's $15 under the lowest total price we could find for a refurb elsewhere. It connects via USB 3.0 or FireWire 800 and is backward-compatible with USB 2.0 and FireWire 200.
Note: No warranty information is provided.