120 for Windows 8.1, 280 for the PRO version ... So it is on the Microsoft Web site. In my opinion, a software too much and so I searched the internet for hours for sensitive, cheaper deals. Often Keys offered for under 10, but there never makes you feel so safe. Finally I came to Amazon for this offer. I opted for a purchase, because it was described as 100% authentic, legal, operating and virus-free, the product was very well rated and I trust Amazon. The Windows Key quickly came by post and by e-mail and everything was as described. The seller provides a very great support, like investing time for its customers and has a clue.
Conclusion: I recommend it to anyone, because you have a great support behind it and you here a genuine Windows 8.1 PRO ! 230 cheaper! gets. Please support the seller with a purchase!