Staples offers the Western Digital Elements 3TB USB 2.0 External Hard Drive, model no. WDBAAU0030HBK-NESN, for $119.99 with free shipping.  That’s $0.04/GB and the lowest total price we could find by $8. Sales tax is added where applicable. This drive uses GreenPower technology to reduce power consumption by up to 30%.

Save $30 by dropping down to 2TB for $89.99.