how much is a windows 8.1 pro product key?

I have loaded 8.1 pro on my dughters puter (32 bit) and would like to load the 64 bit on to mine.
Can anyone tell me how much a new activation key costs? And where might i purchase that key?
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More about windows pro product key
  1. Best answer
  2. you have to purchase your own copy. that will come with the key.
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