From the Super Mario Wiki
The Vending Machines is a place in Mario Party Advance. It is located in the Town Area section in Shroom City. They only sell coal (a pun on cola). If they are visited without a particular reason, the player comments on how the Vending Machines sell coal, but as they do not need any at the moment, they leave. The Vending Machines come into play during Shy Guy's quest, Locomotionless, which involves getting some coal for Shy Guy. He mentions that some coal can be obtained from the Vending Machines, and Mrs. Shroomlock also mentions that they sell coal. Once the player visits the Vending Machines during the quest, they have the option of buying some coal, which they can then bring back to Shy Guy.
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