Amazon offers the Seagate 3TB Expansion USB 3.0 External Hard Drive (pictured), model no. STBV3000100, for $99.99 with free shipping ($0.03/GB). That's $20 under our mention from three weeks ago and the best price we've seen for this model. (It's also a current low by $30.) It features built-in power management.

Update: newegg offers the Seagate 3TB Backup Plus USB 3.0 Desktop Hard Drive, model no. STCA3000101, for $99.99 with free shipping ($0.03/GB). That's tied with yesterday's expired mention and the lowest total price we could find now by $46.