The cost of buying coffee each morning can really add up, and Burger King is offering you the chance to cap your costs. The BK Café Coffee Subscription rolled out last week and offers guests one small brewed cup of coffee every day, at anytime, for $5 a month at participating restaurants. The app-based subscription only includes that one cup per day (no refills), and doesn’t include any specialty coffee drinks. On average, the comes out to about 17 cents per cup of coffee! How much does a cup of coffee cost at Starbucks?