I am a Dumbo fanatic and so am always on the look out for Dumbo merchandise. Besides the plush Dumbo, I've bought wind up toys, ride vehicles, picture frames, pins, ceramic figure.
I know there has been more made over the years, but at one given time I might be lucky to find one dumbo thing besides a plush. I haven't ever seen a lot of dumbo toys like other characters have.
Usually the World of Disney at Downtown Disney might have some Dumbo merchandise as well as shops at the theme parks. Usually what I find at one shop is at the others also unless it is ride/park specific.