Steam's summer sale has started! And now ZC is available for a little bit over $5 USD. I know most of you have already got it, but it's a great way to introduce other people to the game (e.g. by gifting it).
Zeno Clash on Steam
Go check the link, it's on sale until July 10th I believe!
EDIT: now it's on a weekend deal (July 15-17), 3.75 USD!