Staples offers the Seagate 3TB Expansion USB 3.0 External Hard Drive, model no. STBV3000100, for $119.99. At final checkout it automatically drops to $99.99. With free shipping, that's $0.03/GB and the lowest total price we could find by $20, although we saw it for $10 less with padding two days ago (since expired). Sales tax is added where applicable. It features built-in power management.