Only core exchanges for those valves that I know of. Google local trailer shops and give them a call, you might get lucky.
Other than that, a quick separation of components like Patriot76 mentioned is the best bet. Those ECMs and circuit boards are pretty low grade, so those usually go into the "accumulate and dump" pile.
Having said that - failed core, or worn core? I can see if some of the truckers in the shop might be needing some spare parts.
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