I suggest buying machines made by Northwestern, Oak or A&A. You can save money by buying used from eBay or Craigslist. I also suggest doing your own locating because the money that you save locating fees you can put towards buying more machines and stands.
My sales pitch goes like this: "Hi. My name is David. I own a vending business and would like to know if I can place a candy/gumball machine in your establishment."