Where is the story of the non-returner who "sold" pots on the side of the road?

I'm trying to find a specific story in the Pali canon (or commentaries, probably), where an anagami who looks after his mother makes a living by firing pots and putting them out by the side of the road. When people go by, he says "take what you like, just leave some beans or rice, or whatever you think it's worth." Anyone know where this story is found, or what the name of the anagami was?