90% profit from gumballs!

Gumballs I buy cost me less than 1c per gumball. Add taxes and my time and I still make better than 90% profit for every gumball sold. What's better? When I sell gumballs and M&M Peanut side-by-side, I sold twice as many individual gumballs as I did handfuls of M&M's when I carried two of my machines to a local fair. This was from two standard candy machines each standing side-by-side. I found the same to be true when I placed the same machines in an apartment complex clubhouse.

What products yield the best profits for you? Gumballs are one of mine both because they sell fast and because the margin is so high.