The double headed machine is the best vending machine to quick profitability. You can buy them for around $50 dollars and you get two machines in the deal. So, take my advice buy the double headed in the beginning.
Many vendors like the triple headed machines but I dislike them because they don’t hold as much candy or gum as the double headed machines. Meaning you’ll have to make more trips to service the machine for the same profit. They are also more expensive than the double headed machine. They cost around $100 to $125.
The good thing about them is you can offer one extra product. So, if you have to have the triple headed machine then, go for it. But I don’t believe their worth the extra cost and hassle.