As some of you may be aware, Paizo has a few Pathfinder related Humble Bundles right now.
The first is the Pathfinder RPG bundle. This one is crazy for as little as a dollar you can get pdf of the core book, Game Mastery Guide, Beginner's Box, Player Character Folio, Advanced Class Guide, GM's Screen, and the first part of the Hell's Rebels adventure path. For 15 you get Ultimate Magic, Ultimate Combat, Ultimate Campaign, Bestiary 2, part 3 of the Hell's Rebels adventure path, Inner Sea Map Folio, and 23 Pathfinder Society adventures. Pay more than the average (currently just shy of 17 dollars), and you get the Bestiary, Ultimate Equipment, Strategy Guide, Advanced Player's Guide, part 2 Hell's Rebels adventure path, and a Pathfinder Society adventure.
The second is four the Pathfinder comics by Dynamite.This bundle isn't as impressive, but you do get some good comics, free printable battlemats, and the money still goes to a good cause.
If you've ever wanted to get into Pathfinder or if you're a current player and would like pdf's of your books, now is the time to get them.