Question: how much does it cost to buy a windows 10 license?
Answer: Microsoft charges the most for Windows 10 keys. Windows 10 Home goes for $139 (£119.99 / AU$225), while Pro is $199.99 (£219.99 /AU$339). Despite these high prices, you're still getting the same OS as if you bought it from somewhere cheaper, and it's still only usable for one PC.