expired Metro 2033 $3.13 USD (STEAM Key) GameStop
This was posted 1 year 24 days ago, and might be an out-dated deal
The webpage has a habit of changing the prices regularly. You might need to try again and again for a while before you get this price. I waited 3 minutes.
Proof Invoice: http://aciai.me/i/fEu4e.png
Be Aware: If you get $3.22, that's the AUD price. $3.13 is the USD price. It's not going to go any lower!
Also, Saints Row 3 ($12.80). Same process! http://www.impulsedriven.com/saintsrow3