For those of you who've never heard of this, Humble Bundle is a charity event that happens every 2 months or so where you pay any amount you want and decide how that money is distributed between the charity, the game developers, and as a tip to humble bundle. Making the donation gets you a package of preset indie game titles(this is how I got Bontanicula for really cheap) and if you pay over the average donation(which at the moment is $7.68) you get a bonus extra game. The bonus game now is 'Bastion' which is a really fun game worth $15 regular price.

There are 3 payment methods: PayPal, amazon account, and I forget the 3rd option. These charity events only last 2 weeks so make sure and hurry to help a good cause. They will also ask if you want to be emailed in the future to be notified of the next humble bundle event.
You can literally pay 10 cents for 4-5 indie games and it also includes most of the soundtracks to those games. After a week into each event they always add an extra game for everyone so you'll be emailed if that happens to get the new title. There is also an option where you can gift these to other friends. *side-note, if the games are on steam I think you have to donate at least $5 to humble bundle to receive a steam id code if you want to register the games to your Steam account, but who cares about registering games to let people know your playing them*

So go and Google "humblebundle" one word, and there's even a fun little YouTube video on the site describing the games and the goal of the charity itself.