Staples offers the Seagate 3TB Expansion USB 3.0 External Hard Drive, model no. STBV3000100, for $129.99. Coupon code "90889" cuts it to $114.99. With free shipping, that's $0.04/GB and the lowest total price we could find by $15, although we saw it for $15 less on Black Friday. Sales tax is added where applicable. It features built-in power management. Coupon expires December 2.