.

depends if u mean on sale as well

skyrim, just jk, bad rats

Fortix is the cheapest regular game, but Toki Tori goes to less during a 90% off sale.

http://store.steampowered.com/app/55205/
0,69€ base price.

You can sort by price

Team Fortress 2.

Not joking guys, I'm sooooo not joking.

This one is quite cheap

All games on Steam. Of course - if you use The Pirate Bay or any other torrent tracker. TROLOLOL

Spiral Knights? XD

Metro 2033.
It was free for a while, so the only game that can beat it is a game that you are getting paid to play! xD

Well considering you could have got two worlds for the equivalent of 15 cents a while back from pricing error, but for the least with a non pricing error it would be Toki Tori and Bad rats as both are 0.49 cents during sales.

RaceRoom Racing Experience it's free but you can pay $0,1 to get premium stuff (Full game)

TF2. Play the game right and it'll give YOU money.

You could just arrange games based on Price in ascending order.

alien swarm,

tf2

This.

(not (yet) on steam tho)