Zuji's 10c beans
Ive seen the posters near our office for a few weeks and I thought it was just a poster. Little did I know they were actually selling the beans at 10c a can. Great idea from Happy Solidiers for The Hallway Agency.
Digitally it hasn't been supported that well, but the idea is simple enough to not to need much polishing.
You can also sign up to their newsleter and win a years worth of beans $36 worth!