Added (03 Mar 2016, 9:23 AM)
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If you purchase all of the following ($17 or more option) you get the following:

Pathfinder Society Roleplaying Guild Guide (PFRPG) PDF
     Pathfinder Player Companion: Inner Sea Primer (PFRPG) PDF
     Pathfinder Roleplaying Game Core Rulebook (OGL) PDF
     Pathfinder Roleplaying Game GM Screen (OGL) PDF
     Pathfinder Roleplaying Game: Player Character Folio PDF
     Pathfinder Roleplaying Game: Beginner Box (OGL) PDF
     Pathfinder Roleplaying Game: GameMastery Guide (OGL) PDF
     Pathfinder Adventure Path #97: In Hell's Bright Shadow (Hell's Rebels 1 of 6) (PFRPG) PDF
     Pathfinder Roleplaying Game: Advanced Class Guide (OGL) PDF
     Pathfinder Adventure Path #98: Turn of the Torrent (Hell's Rebels 2 of 6) (PFRPG) PDF
     Pathfinder Campaign Setting: The Inner Sea World Guide (PFRPG) PDF
     Pathfinder Roleplaying Game: Strategy Guide (OGL) PDF
     Pathfinder Roleplaying Game Bestiary (OGL) PDF
     Pathfinder Roleplaying Game: Ultimate Equipment (OGL) PDF
     Pathfinder Roleplaying Game: Advanced Player's Guide (OGL) PDF
     Pathfinder Society Scenario #7?01: Between the Lines (PFRPG) PDF
     Pathfinder Society Scenario #6?01: Trial by Machine (PFRPG) PDF
     Pathfinder Society Scenario #6?02: The Silver Mount Collection (PFRPG) PDF
     Pathfinder Society Scenario #6?03: The Technic Siege (PFRPG) PDF
     Pathfinder Society Scenario #6?04: Beacon Below (PFRPG) PDF
     Pathfinder Society Scenario #6?05: Slave Ships of Absalom (PFRPG) PDF
     Pathfinder Society Scenario #6?06: Hall of the Flesh Eaters (PFRPG) PDF
     Pathfinder Society Scenario #6?07: Valley of Veiled Flame (PFRPG) PDF
     Pathfinder Society Scenario #6?08: The Segang Expedition (PFRPG) PDF
     Pathfinder Society Scenario #6?09: By Way of Bloodcove (PFRPG) PDF
     Pathfinder Society Scenario #6?10: The Wounded Wisp (PFRPG) PDF
     Pathfinder Society Scenario #6?11: The Slave Master's Mirror (PFRPG) PDF
     Pathfinder Society Scenario #6?12: Scions of the Sky Key, Part 1: On Sharrowsmith's Trail (PFRPG) PDF
     Pathfinder Society Scenario #6?13: Of Kirin and Kraken (PFRPG) PDF
     Pathfinder Society Scenario #6?14: Scions of the Sky Key, Part 2: Kaava Quarry (PFRPG) PDF
     Pathfinder Society Scenario #6?15: The Overflow Archives (PFRPG) PDF
     Pathfinder Society Scenario #6?16: Scions of the Sky Key, Part 3: The Golden Guardian (PFRPG) PDF
     Pathfinder Society Scenario #6?17: Fires of Karamoss (PFRPG) PDF
     Pathfinder Society Scenario #6?18: From Under Ice (PFRPG) PDF
     Pathfinder Society Scenario #6?19: Test of Tar Kuata (PFRPG) PDF
     Pathfinder Society Scenario #6?20: Returned to Sky (PFRPG) PDF
     Pathfinder Society Scenario #6?21: Tapestry's Toil (PFRPG) PDF
     Pathfinder Society Scenario #6?22: Out of Anarchy (PFRPG) PDF
     Pathfinder Society Scenario #6?23: The Darkest Abduction (PFRPG) PDF
     Pathfinder Roleplaying Game: Ultimate Magic (OGL) PDF
     Pathfinder Roleplaying Game: Ultimate Campaign (OGL) PDF
     Pathfinder Roleplaying Game: Ultimate Combat (OGL) PDF
     Pathfinder Roleplaying Game: Bestiary 2 (OGL) PDF
     Pathfinder Adventure Path #99: Dance of the Damned (Hell's Rebels 3 of 6) (PFRPG) PDF
     Pathfinder Campaign Setting: Inner Sea Poster Map Folio PDF

Added (03 Mar 2016, 2:30 PM)
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As a side note, so far I have discovered that these are not black and white text-only versions of the books.  These are full color text-searchable duplicates of the printed books.  Well worth $17.  Part of the money goes to charity as well.

Added (16 Nov 2016, 11:01 PM)
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Another Pathfinder Humble Bundle:

https://www.humblebundle.com/books....-bundle

The Humble RPG Book Bundle: Pathfinder presented by Frog God Games




Frogs make the best pathfinders. We've teamed up with our frogs friends at Frog God Games, Kobold Press, and Green Ronin to bring you a
new bundle of Pathfinder-compatible roleplaying game books. Tabletop
adventures await just around the corner. Hop to it!
Pay $1 or more for Book of Dirty Tricks, The Black Monastery, Quests of Doom, Cults of the
Sundered Kingdoms, Unusual Suspects, Streets of Zobeck, Zobeck
Gazetteer, and Advanced Bestiary.
Pay $8 or more and you’ll also get Rappan Athuk, Dead Man's Chest, Against Tsathogga, Cyclopean Deeps Vol. 1-2, Advanced Races Compendium, and Your Whispering Homunculus.
Pay $15 or more for all of that plus Halls of the Mountain King, The Mother of All Treasure Tables, Splinters of Faith Vol. 1-10, Deep Magic, Wrath of the River King, and Freeport: The City of Adventure.
Want to backup your Frog God Games
ebooks? Your Humble RPG Book Bundle purchase can be protected! Survive
unforeseen digital disaster with backup access available at the Frog God
Games website. This backup option is available to new and existing
customers who answer a few questions on their download page.
Instructions for accessing the backup files will be sent to everyone
following the Humble Bundle promotion. Check out https://www.froggodgames.com to register for an account!
Pay $1 or more. Together, these books would cost over $417. Here at Humble Bundle, though, you name your price of $1 or more!
Read them anywhere. These books are available in PDF format, meaning you can read them anywhere at
any time. Instructions and a list of recommended reading programs can
be found here.
Support charity. Choose where the money goes – between the publishers; the Navy-Marine Corps Relief
Society; and, if you'd like, a second charity of your choice via the
PayPal Giving Fund. For details on how this works, click here. If you like what we do, you can leave us a Humble Tip too!