Dungeon Siege III is on sale for 60% off at Get Games. I thought this game uses Steamworks but they don’t mention whether or not the game uses Steam on the description page. This game has gotten a lot of flack for being consolized. It has a 72 metascore.
Dungeon Siege III = $19.99 / £11.99 / €19.99
A demo is available on Steam.
Get Games is a UK based site so make sure to pay through or with Paypal to avoid any foreign transaction fees.