2x Seagate ST905003FPA2E1-RK FreeAgent GoFlex 500GB Portable Hard Drive for $99.98. Update the quantity to two and add this Eraser Filler for $0.29 to apply coupon code 62739867, so the total comes to $80.27 shipped. Here is a screenshot for reference. This portable drive does not require a separate power supply and is also smaller than most others, making it more convenient to carry around. Most places have one portable hard drive for over $100, making two drives cost over $200.