Update: The 750GB version is now sold out, but the 1.5TB deal is still good to go.
Amazon has the Toshiba Canvio 1.5TB USB 3.0 portable hard drive for $80 with free shipping, a total savings of $25 off the retail price of $105.
The Toshiba Canvio features fast USB 3.0 connectivity (backwards compatible with USB 2.0), an internal shock sensor to protect the drive from bumps and drops, and does not require an external power source. I have personally been using one of these drives for the past several years and have not had one issue, simple plug-n-play operation.
Buy with confidence, over 888 Amazon reviewers rate it 4 out of 5 stars.
OfficeMax is offering a Toshiba Canvio Basics 750GB USB 3.0 portable hard drive for $50 with free shipping. That is a total savings of 50% off the retail price of $100, about $18 below the average street price, and $10 below the next lowest price.