Would there be a way to set this up so that you could offer "buy two products and get one item of equal or lesser value for free", where if there were 3 items in the cart, it would give the lowest valued item for free. It would obviously need to work in multiples. If 6 items were in the cart, it would give the 2 lowest valued items for free. Is this capable of that? Or is there any way of making it do that?