Buy.com offers the Fantom GreenDrive Pro 2TB eSATA / USB 2.0 External Hard Drive, model no. GD2000EU, for $179.99. This $20 mail-in rebate drops it to $159.99 ($0.08/GB). With free shipping, that’s the lowest total price we could find by $29 and the least expensive 2TB external drive we’ve seen. This “green” drive purports to draw 40% less power than other, non-green units. It features a 32MB cache. Rebate ends October 31.