Download Windows 8 for Testing, Download Windows 8
This is an extremely reasonable price and it will stay valid until January, 2013.
Prior to releasing the full version of Windows 8, Microsoft had offered a release preview edition that allowed enthusiasts to evaluate the new software before making the switch. Now that Windows 8 final is available, the release preview edition has been pulled from the Microsoft website.
If you would like to try out Windows 8 before buying the upgrade pack, here’s an easy way. Go to msdn.microsoft.com, scroll to the bottom of the page and you’ll find links to download the 90-day trial edition of Windows 8. Microsoft provides these evaluation copies for developers but even consumers can download them for trying Windows 8.