newegg offers the Hitachi 4TB Touro Desk USB 3.0 3.5" External Hard Drive, model no. 0S03503, for $169.99. Coupon code "SPECIALDEAL" cuts it to $149.99. With free shipping, that's $0.04/GB and the lowest total price we could find by $16, although we saw it for $10 less two weeks ago. It runs at 7200 rpm and features a 64MB cache. Coupon expires September 30.