Fancy coffee is like 6USD a pound. The benefit of having free coffee at work is to not having to arrange a coworker coffee shrine to put coins in - not the cost of the coffee.
Ah? Everywhere in the world? Why thank you, I had no idea!
Now, one cup = 20g of coffee (for me, could be more or less depending on your brew method). 2 cups a day = 40g of coffee. 5 days a week, 4 weeks in a month = 800g of coffee a month. Multiply that by 2 since my wife also takes her coffee.
Over here, a kilo of the same coffee I got in the office is $50. So that's extra ~$70 a month.