Internal storage: WD Red 3TB NAS HDD $100 shipped (Orig. $155), Toshiba 5TB HDD $150 shipped (Orig. $290)

Best Buy via eBay offers the WD Red 3TB NAS Hard Drive for $99.99 with free shipping, which is $55 below list, $20 better than Amazon and the best current price we can find. Also available via BestBuy.com. Rated 4.5 out of 5 stars from over 2,100 Amazon reviewers. This drive is optimized for a NAS:

Serial ATA interface
Enables simple connection to a compatible network storage device with up to 8 bays.

Data transfer rates up to 6 Gbps
Ensure a rapid response when updating files. Internal data transfer rates up to 147MB/sec.

64MB cache buffer
For fast processing speed.

3D Active Balance Plus technology
Offers dual-plane balance control to help minimize vibration for quiet operation, reliable performance and long-lasting use.

Manual, software, cables and mounting screws are not included.

Need more space and don’t mind losing WD’s NAS optimization? This 5TB Toshiba drive is on sale for $149.99 shipped (Orig. $290).

If you’re looking to dip your toe into the NAS world, then this 1-Bay Synology box at its best price ever would be a great place to start.