This is the best price we are currently seeing on any 4TB portable drive.
Brad's Deals Editor David,
The Seagate Expansion 4TB USB 3.0 Portable External Hard Drive drops from $89.99 to $74.99 with free shipping at Staples.com after you use code 30231 in the cart. Note that you won't see the price drop until after you begin checkout. That's the best price we found by $15 and a good price on a drive of this capacity. It's compatible with Mac and PC, and it can be powered directly over the USB cable. No external power is required. The code also works on the 6TB model, bringing that price to $84.99 shipped. Sales tax is charged in most states.