Fujitsu RE25U300J 300GB USB 2.0 Portable Hard Drive for $54.99 shipped. Here is a screenshot for your reference. This USB portable hard drive does not require a separate power supply like most external hard drives and is also smaller than most of them, making it more convenient to carry around. Note that this deal is valid on 7/27 only. Most places have it for over $140.
This post has been revised.