I would be happy to buy the plastic ships from Twilight Imperium so I can use them in RPGs and Full Thrust without cannibalizing TI.

The coins used in Kingdoms.

Any other parts that you may have extras of after a print run or from damaged batches that cannot be put into boxes…

have you tried calling customer service? half my hunt chips got destroyed for War of te Ring, a game which I don't think they even print anymore, and they managed to find and send some to me free of charge. try calling them you might be able to get what you're looking for.