Western Digital Elements SE 1TB USB 3.0 Portable Hard Drive for $69.99 shipped. Here is a screenshot for your reference. This portable USB drive does not require a separate power supply and is smaller than most of them, making it more convenient to carry around. In addition, the USB 3.0 interface is backward-compatible with USB 2.0 and able to transfer data at 3x faster by using USB 3.0. Most places have it for about $99.