I recall, back in the C-5 days, there was considerable angst over the "$7600 coffee pot." In fact, the cost was for the entire beverage unit that fit into the airplane's galley, similar to the banks of coffee makers and beverage warmers you see in any typical airliner galley. If I also recall correctly, they had to operate on 400Hz power. (I know this was the case for the airliner galley unit used in the Ground Launch Cruise Missile Launch Control Centers.) I recall that the GAO ultimately determined that the USAF was actually buying the units for a lower cost than the vendors were selling the same units to commercial airlines.