I've recently found this interesting site, where you can get steam games, trading cards and more stuffs by playing achievement games, completing task/offers.
I've already ordered and got 9 TF2 trading cards, McPixel and Super Meat Boy. I've also ordered Counter Strike Complete, although i have to wait for around 24 hours to receive it.(i can post a capture of my orders if you want proof.)
Feel free to register here: [Link removed]
Disclaimer!!! The link above is a referral link, if you do not want to help me, then register at [link removed]
Now the giveaway part: I'm giving away a coupon for awesomenauts (66%), the winner will be the first one who messages me with the text: Awesomenauts.
Hope you have fun with the site! :D