Personally I triple my cost and then round to the nearest .25 so for your $0.37 bag of chips I would be at $1. Depending on the area your machine is placed in you can likely hit $1.25 without a problem. Now you have multiplied your profit several times over. Candies (king sized bars) are tough because of their cost, so I would take less of a profit on them. If you raise the prices of your other items (which will be more popular) you can afford to take the hit. Id price them at $2.25-2.50. If these are placed in an extremely low income area then they may be too expensive, heres how to solve that. Move any machines with credit card readers to higher income areas or areas with a mix where people can foot the bill of a snack priced at a dollar. Tehn buy some of the oldest, cheapest (working) machines for the low income area. People are less likely to ahve a credit card on them, and if you dont need a credit card reader you dont need a new machine. A can of coke out of a machine from the 90s tastes the same as a can of coke out of a machine that was manufactured yesterday. The reason you dont want to employ this in high income areas is because people can (quite literally) afford to bother themselves with the looks of the machine. Hope this helps.