From your link: "To install Windows 8 Pro upgrade, customers must be running Windows XP SP3, Windows Vista, or Windows 7." What I don't see is a way to buy a

From your link: "To install Windows 8 Pro upgrade, customers must be running Windows XP SP3, Windows Vista, or Windows 7." What I don't see is a way to buy a non-upgrade version at a sane price ($69 vs. $199) if I want to run a clean version of Windows on the desktop I built. Said desktop is running linux and my primary interest would be running it on virtualbox, but that's neither here not there.