Links for Charity that Get You Interesting Stuff

I'm a big fan of charity sites where you can donate and get something back for your donation.  How does that work?  Well, the site usually has several groups of items at different price levels.  The higher you pledge the more you get.  Proceeds in most cases go to one of more charities that the group who donates designates.  Pretty neat, huh?  Here are two of my favorites at the moment:

• Bundle of Holding:  If you're looking to complete your collection for older games in PDF format or sometimes games still in print this is a great site.  There is a basic level that is set at a particular price and a more "advanced" level where there is a sliding scale where you can get several more books beyond the basic level. The "advanced" price is based on the number of people who have donated so far.  Previous offerings include an assortment of FATE RPG games, the Classic Traveller, MegaTraveller, and Mongoose Traveller games, and several items from the Deadlands role-playing game.   PDFs are stored both on the Bundle of Holding's servers or on DriveThruRPG/RPGNow's servers.  Really can be a bargain when you get the majority of a game line for less that on sourcebook costs these days.
• Humble Bundle:  Similar methodology to the folks at Bundle of Holding. Humble Bundle, though, usually has four different bundles on sale at one time, a basic Humble Bundle, a Weekly Bundle, a Book Bundle, and a Mobile Bundle.  Each of these offer different levels of pledges based on what you want to pay.  The items in your bundle are stored on their servers.  There is also a Humble Store where you can purchase games and other products that are different from the items in the other bundles.

I know there are plenty more out there but these are the two I keep my eye on right now.