World of Warcraft 5 Euros (£4)
Burning Crusade 5 Euros (£4)
Wrath of Lich 10 Euros (£8)
Believe these are digital downloads - but you only need the provided key to register it to yourself.
Until 29th November in anticipation of Cataclysm Release.
If direct link doesnt work...http://eu.battle.net/en/promotion/