In case you haven’t seen the commercials, if you stop in at Starbucks between October 2 and 5 and take part in their VIA Taste Challenge, you’ll get a coupon for a free Starbucks Tall brewed coffee on your next visit.
Check it out here for the details! My next visit will be very soon after the taste test...
You may want to call your store to make 100% sure they're participating.
Another way to get free coffee: Check on new bags of Starbucks ground and whole bean coffee and you may find a note on stating that you will get a free 12-oz. brewed coffee when you take the empty bag into any participating Starbucks.