Hey all, GamersGate is offering a decent selection of Tomb Raider games and DLC at 66% off this week:

http://www.gamersgate.com/games?prio=relevance&q=tomb%20raider

Of note are the 1939 MP Map pack for $1.36 and the Shantytown pack for $1.02. They also have the SP Tomb of the Lost Adventurer for $1.02, and sale prices on all the games. They provide you with Steam keys, so if you're looking to expand your collection or MP maps then this is probably the time.