From the Super Mario Wiki
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After two Piantas bump into Zess T., she drops it, and then Mario accidentally steps on it. Zess T. refuses to allow Mario to pass into Rogueport's West Side until he buys her another. Mario orders a replacement for her at the Toad Bros. Bazaar and after Chapter 1, Mario can buy them for 10 Coins. After Mario gets her the Contact Lens, Zess T. will get out of Mario's way and even be willing to cook foods for him.