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When Mario gives Rowf his calculator.
A Doogan father and son who run Toad Town's only badge shop in Paper Mario. They constantly supply Badges for Mario's shopping needs, though at one point you must retrieve Rowf's Calculator from the Shy Guy's Toy Box. Their shop opens after the end of Chapter One. Although expensive, you should buy as many as possible, some of the badges are one of a kind and very helpful.