Seem like a good price for a new uATX form factor LGA 1150 boards. Does need special 24 pin ATX to 8 pin Dell optiplex power connector though.
NEW 2YYK5 Dell Optiplex 7020 SFF Motherboard LGA-1150 E93839 AM0327 02YYK5 2YYK5 | eBay
NEW 2YYK5 Dell Optiplex 7020 SFF Motherboard LGA-1150 E93839 AM0327 02YYK5 2YYK5 | eBay