For those still stuck in the past. Although it would be nice if they gave the option to upgrade to Win7 instead, because I feel that the transition from XP to Win8 is too great. I have Win8 right now and I would prefer to go back to Win7 myself.
http://www.geekwire.com/2014/microsoft-offers-users-100-credit-new-pc-switch-xp/
http://www.microsoftstore.com/
http://www.geekwire.com/2014/microsoft-offers-users-100-credit-new-pc-switch-xp/
http://www.microsoftstore.com/