Newegg offers the Buffalo DriveStation 4TB USB 3.0 External Desktop Hard Drive, model no. HD-LC4.0U3, for $139.99. Coupon code "TPC1117T30" cuts the price to $109.99. With free shipping, that's the lowest total price we could find by $39. It features interface speeds of up to 3Gbps and can be used to back up your computer via Buffalo Backup Utility for PC or Time Machine for Mac. Deal ends November 30.