Credit to derfmcdoogal on Reddit, this is even better $/TB compared with the Seagate Exos deals. Also a known seller, Newegg.
WD Red Plus 12TB NAS 7200RPM 256MB Cache Hard Drive @ $179.99
Don't forget this is Paypal quarter for Discover It cards, so that's an extra 5% discount (cash back) too.
Canceled my Seagate Exos order for two drives, and changed to three of these Red drives. Would rather replace my older, slower drives, don't particularly need physical space efficiency.