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Greenman Gaming have 50% off all Paradox titles. Most notable is the indie title Magicka, the game and all it's DLC's are 50% off aswell. Magicka registers on Steam. You may also want to check out the Mount and Blade series, these however don't register on Steam.
If you have no issues with it feel free to use my referral link, both our accounts will be credited $5 for a minimum $5 purchase (for new accounts only) http://www.greenmangaming.com/?gmgr=cilogeye