National Coffee Day 2018 exists for good reason. More Americans are drinking a daily cup of coffee than they have since 2012, with 64% of adults over 18 having at least one cup of coffee a day.

Coffee is big business, especially in the United States. Americans spend upwards of $9.7 billion just on dry coffee (meaning mostly beans, whole, or ground) each year. They spend another $2.7 billion getting their fix on the go, buying liquid coffee drinks, including lattes, cappuccinos, and iced coffee.

All day Saturday, Dunkin’ Donuts is offering customers a National Coffee Day two-fer: buy one, and get a second one of equal or lesser value.