simply buy anything for no cost (almost. can only be done online)
first you need to get the item that you want player 1 must interact with the shop get how much they can afford ex: the item costs 300 macca and the team has 3000 macca they must go on the confirm part of the purchase (more info: when you press A on the item, but do not press the buy button yet) then player 2 must waste/use all the macca while player 1 has to wait all macca to be gone or still remain. then player 1 must select to buy the item that you selected. done you get the other items and you get those other items.