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Green Man Gaming just tweeted a new voucher code good for 20% off at their store. The code is: 20PEC-TWEET-SAVER
These guys have been having some good deals as of late. Their Timewarp Tuesday deal is the Stronghold Collection for $9.95 ($19.99).
It comes with: Stronghold, Stronghold 2, Stronghold Crusader, Stronghold Crusader Extreme, Stronghold Legends. This is a castle builder game. Has some solid reviews on the site.