Dunkin Donuts: Text for a FREE medium beverage coupon or enroll in DD Perks Rewards to get 2 medium beverages coupons via regular mail

Text PERKS to 386546 with your email address for a free medium beverage of your choice.

OR

Enroll in Dunkin perk Rewards (it's FREE!) for 2 FREE medium beverage coupons (You get one for joining and the other on your birthday!!!)
Link 
Fine print:

Free medium beverage of choice includes any iced or hot coffee, tea or latte, hot chocolate or Coolatta®. All cooler beverages are excluded. You must complete your DD Perks Rewards account profile within the month you enrolled and include your mailing address in order to receive your free beverage coupon