Bestbuy offers WD - Easystore 5TB External USB 3.0 Portable Hard Drive - Black for $99.99 (orig. $179.99) +Free Shipping.

Product Description:

Enjoy high-capacity storage while on the go with this Western Digital 5TB easystore portable drive. The data transfer rate of up to 5 Gbps enables rapid response when updating files, while the 3.0 USB connectivity offers a simple linkage to your computer. This Western Digital 5TB easystore portable drive features an easy-to-use auto backup software that manages drive settings conveniently.
USB 3.0 interfaceMac and PC compatibleData transfer rates up to 5 Gbps with USB 3.0Automatic backupNTFS formatted