Like the title states. Don't see the SAS versions too often. Seller is reputable (I've personally bought from them) and takes offers. Guessing you could probably get them for $200 a piece. 7 left as of this post. Checked the serial number of the posted image and the drive is not OEM and under warranty until 2021, so I imagine the rest are the same.
HGST 0F23268 Ultrastar He8 HUH728080AL5200 8TB 3.5" SAS 7.2K Hard Drive 829686004221 | eBay
HGST 0F23268 Ultrastar He8 HUH728080AL5200 8TB 3.5" SAS 7.2K Hard Drive 829686004221 | eBay