I haven't bought anything since this deal started, but I did buy Mass Effect 1 for $5 and Mass Effect 2 for $23 a little while ago.
It was a bit silly though because there weren't enough CD keys for those who bought ME1 on sale. Many people had to wait 2 days so Valve could fix the problem.
Demon's Souls Official Thread | Currently playing: Left 4 Dead 2, LittleBigPlanet 2, Magicka