Buy.com offers the Fantom GreenDrive 1.5TB eSATA / USB 2.0 External Hard Drive, model no. GD1500EU, for $69.99. With free shipping, that’s $0.05/GB and the lowest total price we could find by $17. This “green” drive claims to draw 40% less power than conventional drives. It features a 2GB of free cloud backup for six months.