Toshiba PH2100U-1EWR 1TB Automatic Backup USB 3.0 Portable Hard Drive (Red) for $79.00.  Select free site-to-store for in-store pickup at Walmart to save on shipping.  Otherwise, shipping is $2.97 for a total of $81.97 shipped.  Here is a screenshot for your reference. Note that it is compatible with Windows-based PC only.