Newegg offers the Western Digital 4TB Serial ATA 6Gb/s Internal Hard Drive, model no. WD40EFRX, for $154.99. Coupon code "EMCAWNA27" drops it to $139.49. With free shipping, that's the lowest total price we could find by $14, although we saw it for $5 less in May. It features a 64MB cache. Deal ends August 23.