Amazon has the WD My Book 3TB External USB 3.0 Desktop Hard Drive for just $100 shipped. That’s a total savings of 33% off retail and the lowest price ever offered by Amazon. Fast USB 3.0 speeds will ensure quick file transfers and system backups. Don’t worry if you have an older PC or Mac, this drive is backwards compatible with USB 2.0 ports. Includes a 2-year limited warranty. Amazon reviewers love it, giving it a solid 3.5 stars from over 1,200 respondents.