Oh dude, there's literally no way of answering this question.
Firstly because these people don't publish that kind of thing (for the following reasons), secondly because they have data centres of all types littered all over the world and thirdly because "cost" is an incredibly subjective issue - what do you include? just capex? if so for what? include opex? local tax rebates? money-cost? the other hundreds of other classes of 'cost'? I bet these companies have no idea exactly how much it costs them as a whole per data centre let alone on a per machine (and again, what type of machine?) cost. I have ~20 data centres and I'd struggle just working out the most basic of costs, what the tin bills were.
If you've got some specific questions please come back but you're out of luck on this one sorry.