Underwater Fishing, in the editorial someone mentioned that they got a paintbrush from there. (It's really rare)
I think I got a Tyrannian Petpet Brush from Wheel of Monotony, once, waaaaaaay back.
I didnt see it mentioned yet, but sometimes they are also prizes for competitions (CC I think? Recently had a Pirate PB as prizes, maybe the other competitions do it too)
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