This Seagate Backup Plus Slim External Hard Drive drops from $59.99 to $44.99 with free shipping at Staples.com when you pad your order with a low-cost item to get the subtotal to over $60 and apply code 30231 in the cart. For example, you could add this Tru Red Ballpoint Pen for $1.99 to get the code to work. Note that you won't see the price drop until after you begin checkout. This was the lowest price we found by $15. It powers itself over the USB cable. It comes with backup software, as well as a mobile backup app for some content from mobile devices. It's both PC- and Mac-compatible. Sales tax is charged in most states.