Get Metro 2033 (the original version) for free from the Humble store till the 11th of Nov, also they have 50% off the Redux bundle atm too. Just Google 'Humble Bundle' if you've never been there, I didn't want to place a link as the format in Steam can fail sometimes.

If any of you want Payday1 for free quickly join this group they will be giving the game away soon in the next day or so http://steamproxy.net/games/218620 don't wait around do it asap