Newegg via eBay offers the Seagate Backup Plus 4TB USB 3.0 External Hard Drive in Black, model no. STDR4000100, for $104.99 with free shipping. That's $5 under our March mention and the lowest total price we've seen. (It's also a current low by $19.) This 2.5" drive comes with an offer for 200GB of OneDrive cloud storage and is powered via USB.
Newegg offers the Seagate 8TB Backup Plus USB 3.0 External Hard Drive, model no. STDT8000100, for $229.99. Coupon code "EMCETFM25" cuts it to $199.99. With free shipping, that's tied with our mention from three weeks ago and the lowest total price we could find now by $28. It features automatic and mobile backup options.