These deals come around every so often, so they're not earth shattering, but these are great games, and the triple pack especially is a very good deal. I think I've seen Infinite drop to $8, but I've never seen the triple pack go below $15.
Weekend deal only!
http://store.steampowered.com/sub/36223/
Weekend deal only!
http://store.steampowered.com/sub/36223/