Dawn Of War II redefined and refined the RTS genre, and its expansions introduce more of the expanded WH40K universe into Relic's excellent experience. Retribution features freebooter Orks, Tyranids and Eldar as well as a new campaign and gameplay tweaks - and in an interesting twist of fate, the official THQ store's price is actually extremely competitive.
I believe that you can redeem this on Steam, where Retribution is currently selling for £19.99.
Play.com are continuing their £7.99 sale with a cracking price for Dawn Of War II: Retribution. This expansion for Relic's outstanding RTS features freebooter Orks, Tyranids and Eldar as well as a new campaign and gameplay tweaks. The collectors edition bundles artcards, a poster and some unlockable in-game units into the package... and all for less than eight quid. Which, by my reckoning, is less than most retailers would sell the standard edition for.