The Couch Potato via Rakuten Shopping offers the Seagate 4TB Expansion USB 3.0 External Hard Drive, model no. STBV4000100, for $119.99. Apply coupon code "BITCOIN" and pay via Bitcoin to drop it to $89.99. With free shipping, that's $30 below our February mention and the lowest total price we've seen. (It's a current low by $30.) Coupon ends April 8.