Which Cheap Game/s should i buy from steam (less than $1)

i can't think of any ...

look

http://store.steampowered.com/sub/66904/
I own all of these and I can tell you they're the best 0.19 cent games you're gonna get. Polarity is a little meh but the other three are pretty sweet for only 0.19. Plus if you don't like them you can totally make the money back on cards.

How can it be that no one has recommended Bad Rats yet?!

http://store.steampowered.com/sub/8848/

Double pack, great retro RPGs with great humor, and only $ 0,44

The first three Commandos games are like 39 cents each right now. They're old games, but they're something you don't see anymore nowadays. I'd recommend starting with Commandos 2 http://store.steampowered.com/app/6830/

Obulis, Toki Tori (1 & 2), Commandos: Behind Enemy Lines, Chuck's Challenge 3D, Defy Gravity Extended, Diehard Dungeon, Dead Pixels...