You could pick up Saints Row: The Third for $35.96, which uses Steamworks so it will activate on Steam. This game looks really fun.
Or you could pick up Battlefield 3 for $43.16, although it may end up using Origin. Also, personally I’m waiting for info on if any digital stores are going to include the Physical War pack or the SPECACT kit.
Or you can stack the codes on any of the games on sale for their 31 Days of Deals sale.
These codes are first come first serve. I have some more so keep an eye out.