The DLC episodes also discounted
This week you can grab Grand Theft Auto IV for just $9.99 on Xbox Live (normally $19.99). The expansions are also on sale, with The Lost and Damned going for 400 MS Points (normally 800 MS Points), and The Ballad of Gay Tony will run you 800 MS Points (normally 1600 MS Points).
Kind of lame they’re still charging that much for Ballad of Gay Tony, but a good price for the core game if you have some points to burn.