TigerDirect offers the Western Digital 4TB Serial ATA 6Gbps Internal Hard Drive, model no. WD40EFRX, for $139.99 with free shipping, via the directions below. That's tied with our July mention and the lowest total price we've seen. (It's a current low by $15.) It features a 64MB cache. Deal ends September 19. To get this deal:

1. Enter your email address here to bag a $15 off discount link
2. view the Western Digital 4TB Serial ATA 6Gbps Internal Hard Drive for $184.99
3. add it to your cart to drop the price to $169.99
4. apply coupon code "SJE140155" for the final price of $139.99