Tomorrow, April 22, 2011, Starbucks is celebrating Earth Day by offering a FREE brew coffee or tea (up to 20oz) when you bring in your reusable travel mug. If you don’t have a travel mug? No problem. All day long all of Starcuks’ travel mugs will be 20% off, plus they’ll fill it with delicious brewed coffee or tea – on the house. Plus, get 10-cent discount anytime, all year round on any Starbucks beverage when you use your travel mug. [Store locator]