BuslinkBuy via Rakuten offers the Seagate 4TB Bare Drive Serial ATA 6Gb/s 3.5" Internal Hard Drive, model no. STBD4000DM000, for $139.88 with free shipping. (Amazon charges pennies more.) That's the lowest total price we could find by $2. It features a 64MB cache and runs at 5900 rpm. Note, only the drive and Seagate DiskWizard software are included.

Of note, the same drive is available as a retail kit at Newegg for for $169.99. Coupon code "1111NEBLK243" cuts it to $149.99. With free shipping, that's $5 under our March mention and the lowest total price we've seen. (It's also a current price low by $9.) In addition to the drive and DiskWizard software, it includes an interface cable, power cable, mounting screws, user manual, and quick installation guide. Deal ends November 19.