I have my own tip line on Eastern Europe PCB Manufacturers.
Romania - PCB Electra - https://www.pcb-electra.ro/?lang=en
They manufacture industrial PCBs - single sided, double sided and also multi layer. And they are cooler than OSH-Park or Eurocircuits because these guys can handle serious stuff - from 4 up to 24 layers!
I sent them the PCB project for review. More news when I have a reply.