You can currently grab both Dawn of War II for $7.50, and Dawn of War II – Chaos Rising for $5. Both great games, I can vouch. As far as I can tell, they will be on sale for this weekend only. But chances are Steam will have a similar sale that will coincide with the release of Dawn of War II – Retribution, as they often do with new releases.
Oh, and don’t bother with their silly little downloader. Just pop open Steam once you have your product key and punch it in there. Much easier. Good luck killing mutants, burning heretics and rescuing puppies. Well, daemonic puppies.