When looking for a particular train item, train, Locomotive, set and/or rolling stock, I check the available online auction site. Sometimes I find very little if anything. Then on other occasions I find an abundance of what I'm looking for. It just all depends on when sellers list and how many items have been listed.
Was looking for some tinplate items about a year ago, not much. Looked today and found at least 4-6 of those same items I was looking for. Keep looking, it will eventually be listed.