Looks like a good deal for pfsense / storage type of appliance. 16 available at the time of posting.
Supermicro MBD-X10SLM+-LN4F-O - Motherboard Socket H3 LGA-1150 I/O PLATE | eBay
Supermicro MBD-X10SLM+-LN4F-O - Motherboard Socket H3 LGA-1150 I/O PLATE | eBay