Do note that these prices are correct for the digital versions, as physical products are currently unavailable from the EU Blizzard Store. If it's physical versions you're after, and you're in the EU, then the US Blizzard Store with the associated delivery charges and potential for import duty is your only option. But exercise caution, and ensure that any game purchased can be played in your region.
The US sale offers the Battle Chest for $5, Cataclysm for $10, and Mists of Pandaria for $20. US players can get either the boxed version or the digital version for this price.
Mists of Pandaria is here! The level cap has been raised to 90, many players have returned to Azeroth, and pet battles are taking the world by storm. Keep an eye out for all of the latest news, and check out our comprehensive guide to Mists of Pandaria for everything you'll ever need to know.