If you are heading to Dunkin Donuts and would like to get a free item, you can do so by using the offer from Groupon .
You can get anything FREE at Dunkin Donuts (in a form of a cash back) up to $3 on your first transaction.
Make sure you use the same credit card that was register on the Groupon account when paying for your order.
How does this deal work
You can take advantage of this offer by linking your credit card for free, once you get that set up the next thing you can do is swipe your card at Dunkin’ Donuts. Get up to $3 cash back on your credit statement.
They had this offer a few months back which I did tried it and it deducted the amount spent right away..