Buy.com via Rakuten Shopping offers the Seagate 4TB Expansion USB 3.0 External Hard Drive, model no. STBV4000100, for $159.99. Coupon code "SEAGATE20" cuts it to $139.99. With free shipping, that's $0.04/GB, tied with our mention from a month ago, and the lowest total price we could find by $14. Deal ends July 24.