Today only, Staples offers the Western Digital 2TB My Passport 2.5" Portable USB 3.0 External Hard Drive in Silver, model no. WDBPDZ0020BAL, for $89.99 with free shipping. That's the lowest total price we could find by $45.
Although the product description at Fry's advertises USB 3.0 connectivity, according to Western Digital, it only supports FireWire 400 / 800 and USB 2.0. It's formatted for Mac, but can be reformatted for Windows-based systems as well.