I love packaging that you can bring home and re-use. We used to have lots of this (think ball jars, burlap sacks). Some countries still have lots of this going on.
Barth, our coffee guy, told me to take a look at these cups. They are sold at IKEA. $0.29. I pay $0.18 for my current paper hot cups (compostable). Not too far off. Something to think about.