Are any of your many, many 2K Games or Rockstar titles for Xbox 360 in need of a little expansion? Maybe you'd like to have an Undead Nightmare on the Zombie Island of Dr. Ned? Perhaps a visit to Minerva's Den to settle Jimmy's Vendetta? Itching to sing The Ballad of Gay Tony in ... um, the Underdome? These analogies are escaping us, but our bloodhound-esque nose for value is not: All the aforementioned DLC, as well as quite a few other BioShock 2, Mafia 2, Borderlands and Red Dead Redemption expansions are on sale through Xbox Live until January 31.

There are also a few avatar items discounted, not to mention a few full classic games such as Sid Meier's Pirates and Grand Theft Auto: San Andreas. You're not likely to see a fire sale of this scope on the platform any time soon -- check after the jump for the full list of encheapened items.

* Borderlands - Zombie Island of Dr Ned -- Regular Price: 800 Sale: 400 Save: 50%
* Borderlands - New Revolution -- Regular Price: 800 Sale: 400 Save: 50%
* Borderlands - Secret Armory -- Regular Price: 800 Sale: 400 Save: 50%
* Borderlands - Underdome -- Regular Price: 800 Sale: 400 Save: 50%
* Bioshock 2 - Minerva's Den -- Regular Price: 800 Sale: 400 Save: 50%
* Bioshock 2 - Sinclair Solutions -- Regular Price: 400 Sale: 200 Save: 50%
* Bioshock 2 - Rapture Metro -- Regular Price: 800 Sale: 400 Save: 50%
* Bioshock 2 - Protector Trials -- Regular Price: 400 Sale: 200 Save: 50%
* Mafia 2 - Jimmy's Vendetta -- Regular Price: 800 Sale: 400 Save: 50%
* Mafia 2 - Joe's Adventure -- Regular Price: 800 Sale: 400 Save: 50%
* Sid Meier's Pirates! -- Regular Price: 1200 Sale: 600 Save: 50%
* Bioshock 2 Prototype Big Daddy Outfit M -- Regular Price: 320 Sale: 160 Save: 50%
* Bioshock 2 Prototype Big Daddy Outfit F -- Regular Price: 320 Sale: 160 Save: 50%
* Bioshock 2 - Big Sister Helmet -- Regular Price: 160 Sale: 80 Save: 50%
* Borderlands - Bandit Mask -- Regular Price: 160 Sale: 80 Save: 50%
* Borderlands - Moxxi Hat -- Regular Price: 160 Sale: 80 Save: 50%
* Mafia II - Fedora -- Regular Price: 160 Sale: 80 Save: 50%
* Mafia II - Vito's Outfit M -- Regular Price: 240 Sale: 120 Save: 50%
* Mafia II - Vito's Outfit F -- Price: 240 Sale: 120 Save: 50%
* NBA 2K11 - NBA 2K11 Slam Dunk -- Regular Price: 240 Sale: 120 Save: 50%
* Los Angeles Lakers NBA Jersey M -- Regular Price: 240 Sale: 120 Save: 50%
* Los Angeles Lakers NBA Jersey F -- Price: 240 Sale: 120 Save: 50%
* Boston Celtics NBA Jersey M -- Regular Price: 240 Sale: 120 Save: 50%
* Boston Celtics NBA Jersey F -- Regular Price: 240 Sale: 120 Save: 50%
* Axel & Pixel -- Regular Price: 800 Sale: 400 Save: 50%
* The Misadventures of PB Winterbottom -- Regular Price: 800 Sale: 400 Save: 50%

* GTA IV - The Lost and Damned -- Regular Price: 800 Sale: 400 Save: 50%
* GTA IV - The Ballad of Gay Tony -- Regular Price: 1600 Sale: 800 Save: 50%
* RDR Undead Nightmare Collection -- Regular Price: 1600 Sale: 1000 Save: 38%
* RDR Undead Nightmare Pack -- Regular Price: 800 Sale: 400 Save: 50%
* RDR Legends & Killers -- Regular Price: 800 Sale: 400 Save: 50%
* RDR Liars & Cheats -- Regular Price: 800 Sale: 400 Save: 50%
* MC LA South Central Ultimate Content Pack -- Regular Price: 1000 Sale: 500 Save: 50%
* GTA San Andreas -- Regular Price: 1200 Sale: 600 Save: 50%
* Max Payne -- Regular Price: 1200 Sale: 600 Save: 50%
* Max Payne 2 -- Regular Price: 1200 Sale: 600 Save: 50%
* RDR - Armadillo Undead Outfit M -- Regular Price: 320 Sale: 160 Save: 50%
* RDR - Armadillo Undead Outfit F -- Regular Price: 320 Sale: 160 Save: 50%
* RDR - Lasso -- Regular Price: 240 Sale: 120 Save: 50%