If you can't find one you can order the board from JLPCB. I've got a list of the parts needed to assemble the board I can dig out.
https://jlcpcb.com/
Gerber file for the board.
https://github.com/lucky01/PIN2DMD/blob/master/hardware/V4%20NUCLEO-144/V4.03%20GERBER.zip