A year ago I was browsing the Steam Winter Sale and found "Fallout: New Vegas" on sale for the price of a cup of coffee.
As you may have noticed, that was the beginning of my obsession with the post-apocalyptic Mojave. It's easily one of the best games I've ever played, with strong storytelling, compelling characters, biting humor, and well thought out world building. If you want to see why I love it so much now's the time- it's on sale once again. The base game is just $2.49, while the deluxe package with every DLC package is $6.79. I'd strongly suggest getting the deluxe package. The additional content adds a huge amount of material to the game.