Aug 21 1989 Free medium dark roast coffee at Dunkin Donuts – with app Posted on August 21, 1989 by DealFinder Rating: 0 Posted By: theedge103 Views: 118 Replies: 0 Download the DD app on your smartphone and you will have a coupon for free dark roast coffee for today! (Then take your receipt and do the survey and get a free donut! ) Great fuel for Black Friday. Dunkin Donuts Deals Fatwallet.com Free Stuff