Good Luck!
If you like FREE Steam games, please check this site: TremorGames
It is a site in which you can complete offers (like watching videos and complete surveys) and earn coins, that you spend in games.
Check my Steam library, half of those games are from TremorGames! ;)

And this instead is a site in which you can buy games at ridiculous prices (warhammer 40k GOTY, Company of heroes less than 1€???):G2a.com

If you don't trust the links, please just search in google "What Is Tremorgames" and "What is G2A.com", and you will find every answer you are searching for.
...or you can simply ask me! :)

Please take a look at them, and enjoy giveaways! ;)