It wouldn't be any cheaper to buy just a product key, so you may as well just buy another boxed copy.
It's the product key that is the only thing that really matters. You can use any copy (of the same edition) to install Windows, you just need a product key for each installation. This is handy to keep in mind if you want to re-install Windows on a system that has the product key on a sticker, but you don't have the 'original' disk.
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