Valve titles appear on Impulse

RPS has noted that Valve has made its games available on GameStop download service Impulse. The marketplace, which was owned by Stardock up until last year when it was bought by GameStop, now has five titles from the company: Portal 2, The Half-Life Complete Collection, Left 4 Dead 1 + 2 and The Orange Box, all of which end up requiring Steam activation anyways. Still, your options on where to buy Valve games has become more broader now.

More details here.