BuyDig offers the Seagate 1TB GoFlex Thunderbolt Portable External Hard Drive for Mac, model no. STBA1000104, for $138. Coupon code "DIG5" cuts it to $133. With free shipping, that's $0.13/GB, $12 below our September mention, and the lowest total price we could find by $11. This hard drive features Thunderbolt technology which purports to be up to twice as fast as USB 3.0 and up to 12x faster than FireWire 800.