Ya, we've been searching for used ones, but haven't had much luck. I guess we'll just keep looking. We did see one on eBay that seems like the exact part we need, however they're listing a different part number.
When I did the search by part number one of the URL's that came back was an RV salvage yard. That might be an option for you to check out. The issue may be finding a cross-reference to what RV's that unit was installed into.
2010 Winnebago Vista 32K with a 2013 Mini Cooper S Roadster toad.