its gonna be a hard sell being 15 trying to convince people to let you put those places... chances are they will also charge you to have them in their stores/malls..
before you invest any money into the machines i would go around to places you *think* you would want to put them and ask them. Also i would bet a large percentage of malls/stores (target, walmart, ect.) have exclusive contracts with people like Jimmy Jingle and such.
but good luck either way