Caribou Coffee is offering a FREE punch card. Buy 7 beverages between now and September 5th, 2011 and get any medium drink for FREE. It looks like they may have a punch card for 7 food items and get the 8th FREE with some limits applying.
With their white peach berry, mango orange key lime, pineapple coconut, and strawberry banana smoothies I think purchasing 7 drinks over the summer will be too easy for me to do. Remember to take your own reusable cup and save an additional $ .50 on each drink, any time, any day.