December 12, 2009 No Comments Free Medium Coffee at Dunkin Donuts Free Medium Coffee at Dunkin Donuts Enroll in the ‘Win Coffee For A Whole Year’ program. Use the promotion code DDPERKSCoffee and they will mail the coupon. Free Medium Coffee at Dunkin Donuts – EXPIRED Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.