Hey guys there's an awesome site where for doing adware things like downloading an app on your phone, or watching a video or even better: playing games that have achievements, you get points and can use these to buy games, steam cards, steam emoticons etc. The prices are very cheap as in a day I bought Race 07 from there, then some days later another Race 07 for a friend and now I bought Race Injection. Yes, it takes up to 2 days to get the redeem code but still it's worth the time spent. If you want to register, go here and press on the top right register: http://www.tremorgames.com/?ref=443268
This is the best site that does that overall, as the others have really high prices.