You could always call them up and say "Hey you, your exorbitant prices just cost you another customer, I'm switching to Ubuntu" and go on and on about the joys of free software

It won't get you a free copy of Windows, but it will make you feel good, and maybe if enough people get fed up with Microsoft then they will change their business practices -
ya know, kinda like voting for a third-party candidate, how it won't get you anything in the short run but in the long run it tells the major parties where to align themselves to garner more votes?
