Adorama offers the Seagate 4TB Expansion USB 3.0 External Hard Drive, model no. STEB4000100, for $129. This $40 mail-in rebate cuts it to $89. With free shipping. That's $11 under last week's mention, the lowest total price we could find today by $30, and a very low price for any 4TB USB 3.0 hard drive. Rebate expires April 30.