How can children's photography cooperate with kindergartens?

How much you spend in the toy store, give a few inches of photo free card "be sure to indicate free", buy more and give more. How much does it cost to take a set of photos in the photo studio and give away the corresponding toys for free shopping? Support each other and take care of each other, as long as one side benefits. Both sides benefit. Why not do it? A little insight, for reference only.