As one of its daily deals, Best Buy offers the Western Digital 4TB NAS Serial ATA 6Gb/s 3.5" Internal Hard Drive for $119.99 with free shipping. That's tied with our March mention and the lowest price we could find by $30. It's designed for NAS systems and features a 64MB cache. It also comes with your choice of $20 to spend at Shutterfly or a Shutterfly 8x8" photo book. Deal ends today.