The company I'm working at has a plumbed flavia dispenser.
It's like This One but a little bigger and holds more refuse before needing to be emptied.
Basically, it's a single serving coffee, tea, hot cocoa, espresso, cappuccino, etc machine. Overall cost is about 55 cents per cup.
It's quick, tasty, convenient, and high in CRACK COCAIN!
They have SOHO machines for $99 to $199, but you cannot plumb these. The office-grade ones have a menu to choose what and how you brew, and they brew faster, and use lower power than the big home one.
I don't know what the big ones are, but the way it's priced, I'd expect you'd pay 60 cents per cup and be loaned the machine indefinitely, assuming you had regular, high-volume service.