As one of its daily deals, Amazon offers the Seagate 4TB Serial ATA 6Gb/s 3.5" Solid State Hybrid Hard Drive with 8GB SSD, model no. ST4000DX001, for $139.99 with free shipping. That's tied with our expired mention from three days ago as the lowest total price we've seen. (It's also a current low by $16.) It features a 64MB cache. Deal ends today.