They've turned to Blue Diamond to supply Vanilla Almond Breeze Almondmilk at select Dunkin' Donuts locations nationwide.
According to the company, almond milk is now the most popular non-dairy alternative in the U.S.
Locations offering almond milk are denoted by a special "AM" symbol on Dunkin's online store locator. Insofar as whether the almond milk will cost you more, I contacted the company and was told, "Pricing decisions at Dunkin’ Donuts restaurants are made by the individual franchisee."
Rival Starbucks currently offers soymilk as a non-dairy alternative to milk.