Just do a search for invaluable(a web site that lists various auctions) and do a search for what you are looking for. In this case “Ross switches” or MTH or Lionel or Gargraves, Etc.
My personal favorite is Stout auction site. There are numerous auction sites. Some I have used are Gateway gallery, cabin fever, toys, trains and other old stuff and several others. Let me know if you have trouble with the search or other questions.
As an example cabinfever auctions recently auctioned off items left in the MTH warehouse.