Nux is a bizarre claymation shooter that's currently 75% off on Steam... but you can save an extra 50% courtesy of Daily Indie Game! You can buy Nux for just £0.68.
Now we have to point out that Nux is not a good game by most accounts, and you should definitely do you homework on this one (sorry, I can't vouch for it personally). But a deal's a deal, and this is by far the best price around. Thanks for the tip, gooner!