a good game for less than $4.00?

Use steam search filter?

The Binding of Issac provides extreme gaming value for the fun that the game provides

shadowrun was under, dont know it still might be

Far Cry 3: Blood Dragon or Shadowrun Returns for $3.74, or The Bureau: xcom declassified for $3.99.

This topic on reddit may be of interest. Also check the other thread it links because the first game it mentions is Primordia, and I love Primordia. :-)

Super Crate Box

The Witcher 2. it's 3.99. less than 4 bucks

sorry if can't respond to everyone

witcher 2 , skyrim

Fallout New Vegas and Divine Divinity together?

payday 2 and skyrim are both under 4 €

At £2.16 you might as well get PayDay 1 and the Wolfpac DLC.
You could even get the 4-pack for £2.99 and give 3 copies to your mates so you can all rob banks together

Brothers - A Tale of Two Sons at $2.99