Looking for a used but working TKS MX-300 Radio

I currently have 3 of these I rotate to keep 2 working in the plane.

Anyone have an old but WORKING one lying around they don't need/want anymore? I know many are upgrading and have no use for older radios. Offering $500-650 for a WORKING one, preferably one with a "dark" face on it to match my other two. See photos below.

Alternatively, does anyone know where to get one repaired? I was calling around today and no one was interested in dealing with it anymore. They cite a paucity of parts, service manuals, and trained techs to work on the MX-300 radio anymore.

Thanks - and yes, I know they are $3,500- $5,000 online for a newly factory-refurbished one - simply do not have that kind of $$$ for a 20+ year-old radio that is considered obsolete by most of the aviation community.

Thanks for any offers or advice you can provide. I will certainly opt to REPAIR the ones I have if anyone knows where to send them.

Regards, Mike
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Last edited by Mike Marra; 08/28/23 06:52 PM. Reason: spelling error