Bestbuy offers WD - Easystore 5TB External USB 3.0 Portable Hard Drive - Black for $89.99 (orig. $179.99) +Free Shipping.

Product Description:

Enjoy high-capacity storage while on the go with this Western Digital 5TB easystore portable drive. 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 compatibleAutomatic backupNTFS formatted