There was was main PCB listed for sale almost two weeks ago. Do advance search for Jedi. Otherwise they don't come up for sale that often. Good luck trying to find parts. It took me years to find missing parts to restore both of my arcades. Your probably better off buying a complete arcade and having it shipped to you.
Both of my ROTJ arcades came with monitors with disco chassis in them. I was told that the original monitors where junk anyway. I could not find parts to repair the disco chassis so I installed different monitors in both of them.