Newegg offers two Seagate 4TB Backup Plus USB 3.0 External Hard Drives
(8TB total), model no. STCA4000100, for $234.98
with free shipping
($0.03/GB). That's $117.49 per drive, which is $3 under yesterday's per-drive price and the lowest we've seen. (It's also $25 under the best we could find for a pair of these drives elsewhere.) It features two backup scheduling options and social network sharing.