Rockstar XBOX Live Arcade downloadable content is discounted until January 31st:
Grand Theft Auto: San Andreas (Regular Price: 1200 Sale: 600)
Grand Theft Auto IV: The Lost and Damned (Regular Price: 800 Sale: 400)
Grand Theft Auto IV: The Ballad of Gay Tony (Regular Price: 1600 Sale: 800)
RDR Undead Nightmare Collection (Regular Price: 1600, Sale: 1000)