From the Super Mario Wiki
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The Star Shop is one of three equipment stores located in Mall in Mario & Luigi: Bowser's Inside Story. Aside from its main function as a store, it also offers complimentary Royal Mushroom Tea, massages, and mustache shaves, the latter which Mario hastily denies. The Mario Bros. can shop here once they have achieved the Star Rank. Otherwise, the Toads at the entrance will stop the elevator and politely ask Mario and Luigi to leave.