February 16, 2010 No Comments Free Medium Coffee at Dunkin Donuts Free Medium Coffee at Dunkin Donuts Enter promotional code DDPERKS when you join the Dunkin Donut Perks and they will mail you the coupon for a free medium coffee. 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.