Some museums have displays of shops (or things from shops, in the past).
Some museums have gift shops.
Even when you don't buy an object, you can still admire, inquire, or (maybe) photograph it to ask about or think about later.
photo by Sandra Dodd
(Read more about why experienced unschoolers sometimes seem pushy, at the link below.)
Joyce Fetteroll, in helping others untangle ideas and prejudices about what children think they "need":If someone needs three glasses of water a day and only gets two, they'll spend the rest of the day trying to get that third glass. So it will seem to others like this person's constantly thirsty and can never get enough. But if he gets three glasses and can have as many as he wants, he won't seem thirsty at all.