Here's a couple items I've recently run across. While in New York, I wandered through Fishs Eddy, a fun shop that carries a variety of dishes and housewares. Among other things, they offer a set of Oz drinking glasses featuring W. W. Denslow images of the famous four. Of course I picked up a set - though I think it's unfortunate that they didn't pick a better image of Dorothy! Some very fun dishes relating to Alice in Wonderland are also available.
Friends occasionally run across Oz-related items and pass them on to me - for example, this set of glittery ruby slipper soap. Perhaps they produce Glinda bubbles? It just shows how embedded the Oz imagery is, particularly the MGM movie.