These have come down in price so much. They're not the cheapest price/GB, but if you're wanting more storage and have a limited number of drive bays maybe these are worth it? 15TB on a single drive is a lot.
$1500 11 hrs left 0 bids
https://www.ebay.com/itm/15TB-Samsung-PM1633a-Enterprise-Class-SAS-3-0-12GB-s-SSD-2-5-3D-V-NAND-MLC/192984945490
Seller has a new one for $1800 and 11 hrs left 0 bids
https://www.ebay.com/itm/15TB-Samsung-PM1633a-Enterprise-Class-SAS-3-0-12GB-s-SSD-2-5-3D-V-NAND-MLC/192984945486
Different seller $1600 OBO
https://www.ebay.com/itm/HPE-15-36TB-15TB-2-5-12Gbps-SAS-SSD-Model-VO015300JWCNL-PM1633a/333269351559
Then there's this if you want to play the OBO game for more
https://www.ebay.com/itm/New-Open-Box-867212-002-HP-15TB-SAS3-12-0Gb-s-SFF-Enterprise-SSD-with-SC-Tray/264304779392
$1500 11 hrs left 0 bids
https://www.ebay.com/itm/15TB-Samsung-PM1633a-Enterprise-Class-SAS-3-0-12GB-s-SSD-2-5-3D-V-NAND-MLC/192984945490
Seller has a new one for $1800 and 11 hrs left 0 bids
https://www.ebay.com/itm/15TB-Samsung-PM1633a-Enterprise-Class-SAS-3-0-12GB-s-SSD-2-5-3D-V-NAND-MLC/192984945486
Different seller $1600 OBO
https://www.ebay.com/itm/HPE-15-36TB-15TB-2-5-12Gbps-SAS-SSD-Model-VO015300JWCNL-PM1633a/333269351559
Then there's this if you want to play the OBO game for more
https://www.ebay.com/itm/New-Open-Box-867212-002-HP-15TB-SAS3-12-0Gb-s-SFF-Enterprise-SSD-with-SC-Tray/264304779392