But he is probably wanting to offer it as an amenity, and possibly only have 1-3 machines.

Check out the Beaver line. Made in Canada with commercial coin mechs. That's what I usually see in the malls around here. I've had a Beaver gum ball machine for a few years. It's been flawless for me.

I also had a pop machine going for awhile. I wasn't on-site so it was a bad deal. On site would be easy. If you're not too concerned about making the 'most' profit possible on these, then just rent one from Coke, Pepsi whatever. They'll maintain it, but you fill it.