Bioshock 2 $5
Minerva's Den $5
The Protector Trials Free
Killing them Kindly Free
Sinclair Solutions Tester Pack $2.50
Rapture Metro $5
Zigo and Blanche $1
You can use Microsoft Points to buy. The game itself has been $5 dollars at a lot of places, but the only two places, at least that I know of, to buy Minerva's Den is GfWL and D2D (which still has to be activated on GfWL).
Since this is a Deal of the Week it should end 12/1/2011 unless Microsoft extends it for being buried in the site.
Edited by Zin_LG, 01 December 2011 - 04:16 PM.