Dunkin Donuts: FREE Medium Beverage and More April 3, 2011 This post may contain a link to an affiliate. See my disclosure policy for more information. Currently, when you sign up for the Dunkin Donuts Perks program, you’ll get a coupon for a FREE medium beverage! This includes any iced or hot coffee, tea or latte, hot chocolate or their Coolatas. You will also receive a coupon for your birthday!