Sign up today to receive a free trial sample of our Dunkin’ Donuts® Cold Brew Coffee Sample Pack. Offer valid May 07, 2018 through May 17, 2018, while supplies last. Offer open to individual residents of the 50 United States and D.C. only, ages 18 or older. Limit: one sample per person/email address/household. See the terms and conditions for complete details.