Why don't you do something that will really save us some money like start the free Computer movement or free car movement. Because as it stands right now, running Linux vs. Windows the cost differences are neglible. I can find studies that show you Linux is a bit cheaper and others that Windows is a bit cheaper. Why not try to make my house free, my car, energy, gas, etc....? You know things that actually cost me money.
And don't you dare say that's silly because those things cost money or any other lame answer, because I'll just repeat all the stupid arguments you have for free software.
A really excellent point, especially considering software costs, much less itemized operating system cost, is minuscule compared to overall operating budget, which is eaten alive by hardware but even more eccedingly by manpower costs.
Unfortunately a lot of these guys won't understand, because the only budget they control is their own personal billfold.