You can almost think of this like a coin bank if you like m&m's or gum.
I used to visit Dunis Distributing in Portland, OR where they probably either sold, rented, and repaired vending machines. It was a neat place.
antique gumball machines, $59-150
takes any size coin up to a quarter but only gives you one item. takes reeses pieces, m&m's chocolate and similar-sized candy such as jelly beans and gumballs. on the front page of their site, the featured machines have a flathead screw on the top to get access to the gumballs. they even have dubble-bubble machines.
every kind of vending machine imagineable.