Even though it's totally the end of Winter over here. These details are not important. All the cheap games. That's what's important here.
And there are more than a few of them, especially if you're keen to pick up a few indie games on the cheap. Nidhogg is $4.99, FTL is $3.33 and Monaco is $1.49.
Also I'd be doing myself a disservice if I didn't mention the fact that Trials Fusion is on sale for $14.97. It might not hit the dizzy heights of the almighty Trials Evolution, but it's still a Trials game and it's still incredible.
The perennially on-sale The Walking Dead Season 1 is $6.24 but you have that already. I know you do. Batman: Arkham City is $4.99.
And a final recommendation -- a game I love very much -- Pixel Junk Monsters Ultimate is $1.49. I loved that game so much back in the day.