Wind Turbines Power

What items have a motor that is good for a wind turbine generator?

I work at a place where people drop off stuff for free, and I salvage what I can and sell the items for just enough to pay for the electricity bill. I was wondering what kind of items that would normally be no good would have a motor in it that would be good for a wind turbine. As a company that pushes for going green, I think having green energy, by making wind turbines, would be great for this small company.

I've read that treadmills have good ones, and older computers. What other things would have them?

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