If you frequent Dunkin’ Donuts this is a great deal! You will get 100% cash back (up to $3.00) on your first purchase only and 10% cash back (up to $3.00) for a maximum of 5 additional purchases through 9-27-18. Limited to 1 transaction per visit when you buy through Groupon for a limited time only. Valid on in-store or Dunkin’ Donuts mobile app purchases.