First of all here is the website you need to do exactly what your wantiong to do to install windows on a machine at a cheaper price. Registered Refurbisher FAQ
Now using the key on the laptop may work it is not legal. One your not the person who purchased it if your talking about scrap laptops. Second if you have to put a hard drive in the machine because it was taken out by the last owner you cant use the same key either. If you sell them on ebay this way you bet you will get shut down eventually. I know 2 people personally this has happened too. They got letter from microsoft threatening law suites if they didnt stop.
Now the cost will be about $35 per liscence once your in the program. You have to buy them in 3 packs though from distributers.
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