Today only, newegg offers the Buffalo Ministation 500GB Thunderbolt USB 3.0 Portable External Hard Drive, model no. HD-PA500TU3, for $199.99. Coupon code "THUNDER20" cuts it to $179.99. With free shipping, that's $0.36/GB and the lowest total price we could find by $17. It features data transfer rates of up to 10Gbps.