Amazon offers the Seagate Expansion 3TB USB 3.0 External Hard Drive, model no. STAY3000102, for $119.99 with free shipping ($0.04/GB). That's tied with our mention from six days ago (which also charged sales tax in more locations) and the lowest total price we could find. This drive is purported to run 3x faster than a similar USB 2.0 device when connected to a USB 3.0 port.

Of note, Best Buy charges the same, however sales tax is applied in more locations.