Bolder is a website that does a lot of good for people and the environment by offering "challenges". Things like "Master the 4 minute shower" or "Donate $10 to the Redcross to help the people of Japan". Sometimes the challenges offer a reward if you choose to act on the challenge. Right now, if you choose to take the Stonyfield challenge to REUSE your food containers, you'll get a $1 off coupon good for one 32oz. container of Stonyfield organic yogurt. Its a great site, go check it out!