There might be others, but Lyman makes a "Turbo Twin" tumbler that contains two bowls, the smaller being half the size of the larger. That should suit most needs. Might be able to find one used online or at a show.
Sure wish Redding still sold their heavy-as-lead red tumbler. But the Lyman works fine for me - I use quarter-round as a fence to keep it from walking. Nice to have the smaller bin available.