I BO'd on this 12tb HGST Helium and got it for $350. It's the cheapest I've see a 12tb go for. I'll post back once i get and see what king of smart data it has. Gonna use in my snapraid box probably as the new parity drive so then i can add in 12tb drives if and when I can get them
HGST 10TB Hard Drive 7200 RPM Ultrastar He10 SATA 6Gs/s 256MB 3.5" 0F27452 783555124222 | eBay
HGST 10TB Hard Drive 7200 RPM Ultrastar He10 SATA 6Gs/s 256MB 3.5" 0F27452 783555124222 | eBay