Thumb Score: +27 BestBuy.com has 4TB Seagate Backup Plus Portable USB 3.0 Hard Drive (Black, STFM4000100) on sale for $79.99. Shipping is free or select free store pickup where available. Thanks TheNarratorr Amazon.com also has 4TB Seagate Backup Plus Portable USB 3.0 Hard Drive (Black, STFM4000100) on sale for $79.99. Shipping is free.