I would try RV salvage yards.
The list below is from a post to IRV2 Sep 2020. You will need to copy and paste the links.
Here's a list of salvage yards that I have compiled.
http://www.fivestarrvgroup.com
RV Salvage Sources
http://www.glen-l.com/campers/suppliers.html
Used RV Parts And Used RV Accessories | Visone RV Monaco Parts Dealer | rvparts.visonerv.com
http://msrheaters.com/defrost.html
Northwest RV Supply Northwest RV Supply
Veurinks RV (Sue) 616-965-9619
http://colawrvsalvage.com
https://bontragers.com/rv-supplies-accessories/
http:/rverscorner.com/url=http%3A%2F%2Fwww.rverscorner.com%2Frvsalvage. html#2800
https://www.azrvsalvage.com/home.html
RV Surplus
Singletonsrv.com
Sullivan RV Sales and Service
Alliance coach, Wildwood FL
http://www.factoryrvsurplus.com
https://www.johnsonssurplus.com/
http://www.rverscorner.com/
http://www.myrvparks.com/forums/showthread.php?t=1656
https://rtrvg.com/blog/2017/07/22/us...ards-by-state/
https://www.rvresources.com/rvsalvage/
https://www.azrvsalvage.com/