Ending today, TigerDirect offers the Seagate 4TB Serial ATA 6Gb/s Internal Hard Drive for NAS, model no. ST4000VN000, bundled with PowerUp Hard Drive Screws 5-Pack for $169.99. Coupon code "FWY136519" cuts it to $149.99. With free shipping, that's the lowest total price we could find for the HDD alone by $20, although we saw it alone for $6 less in June. It features a 64MB cache, NAS error recovery control, improved vibration tolerance, and advanced power management.