Call of Duty Ghosts/Advanced Warfare
Starcraft 2: Heart of the Swarm
Also, steelbook copies of some indie games are $1.97
There are also a lot more games under the $1 mark that's also worth looking at for. Moral of the story: go to gamestop's website, go to all pc games, set the filter to "new" and sort by lowest price on a monthly bases.
I got COD Ghosts at my Gamestop and the Cashier looked bewildered when he rung it up. Didn't have a box but still worth it. It was also the pre-order edition.