I work in a grocery store that sells coffee in those insulated coffee cups. For the longest time we just had them sitting on the cupboard upside down. The cups would get dusty and dirty from sitting where they were, so I made a dispenser to house them. This is a fairly simple design, each of the three cup sizes has its own compartment. It runs diagonally at about a 55 degree angle. Everything was brad nailed and glued together. The dispenser is just a small tension spring screwed to either side.