I have a 6 inch one, dark round unglazed with rivets, Ittouen from Tokoname. Wasn't really looking to sell it but if the price is right, I don't have anything to put in it right now...
You can contact Sonny Boggs on FB. If he doesn't have something already I'm sure he would custom make whatever you want and it would probably be a lot cheaper than Rayner (although I also love her work).