Every week there are various sites that bundle games together and provide Steam keys to you for cheap. Usually these are indie games or games that have been on the market for some time. These are not bad games by any means! Surprisingly, there are several you should check out this week:
Humble Borderlands Bundle
This set of games from Humble Bundle is a really good value, especially if you have never played the original Borderlands. For just $1, you receive Steam keys for the original Borderlands and all of the DLC. One of the best games I have ever played, and I have sunk hours into that title. As you can see below, the different tiers unlock more content for various Borderlands games. I cannot recommend this bundle enough.
Shockwave bundle from Bundle Stars
This bundle from Bundle Stars features some really cool games that have been on my radar for awhile now. The $3.49 price of entry is worth it for the games 140, Vertical Drop Heroes HD, and Boson X alone. Everything else is just bonus. One of the better deals to come through this site in a long time.
Humble Weekly Eye Candy 3 Bundle
These games in the newest weekly Eye Candy Bundle all feature art styles that in my opinion are very impressive. Don't miss Tengami, Back to Bed, and Valdis Story. All great titles for very cheap!
So just to recap, assuming you bought every game at the highest bundle tiers for all three links at the current prices, you would spend $23.03 total for 19 games and 9 Borderlands DLC packs + more Steam keys to be announced later. You can't beat it!