Dunkin’ Donuts® packaged coffee is available at grocery stores. Dunkin’ Donuts coffee fans can share a photo of themselves with their mug of coffee to win exciting prizes including a $10,000 Grocery Gift Card, one-year supply of Dunkin’ Donuts packaged coffee and an extra-large Dunkin’ Donuts branded mug. Contest: Open to everyone in the US over the age of 18 years. The contest ends on August 26th. The prizes are drawn randomly every week, with the grand prize drawing on the 29th of August.