Use this trick if you have a friend that also owns the game and he or she has an item that you like. First, go to your friend's town or invite them over to yours and ask them to drop the desired item. Take it and, because you are holding it, the item should now be in the catalog at Tom Nook's store. You have to buy it, but now you and your friend will have the item. Return the item to your friend. Note: This doesn't work with Gyroids or fossils.