Humble Bundle
Lets buys some games for $1-$100 and donate to charity at the same time.
Humble Bundle is a service that works with video game developers, and publishers to give back to charity. Every time you purchase a Bundle you give a portion to charity. You can choose to buy the bundle for $1 or a amount that you feel is fair. Of course purchasing these games for $1 would be unethical but its entirely up to you. The games listed above may not appeal to some but just recently the new bat man game Dark asylum and fear 2 were up for grabs.
If you don't want to check the site every time a new bundle is up, you can set a notifications through email.
You can see humble Bundle HERE