Here’s a bit of a breakdown:
For $1.00 or more receive PDFs of Guide to Absolom, Cities of Golarion, the Inner Sea Primer, and more for a total of seven PDFs.
For $10.00 or more add titles such as The Inner Sea World Guide, Guide to the River Kingdoms, Isles of the Shackles, and more for a total of 16 PDFs.
For $18.00 or more you’ll add Guide to Korvosa, City of Strangers, Lands of Conflict, and more for a total of 27 PDFs.
For $25.00 or more you’ll also receive titles such as Aquatic Adventures, Distant Worlds, and People of the Stars for a total of 39 PDFs.
And for $40.00 or more you unlock everything (with an MSRP of $679.00) which also includes Legacy of the First World, Planes of Power, Horror Realms, and more for a total of 50 PDFs.
All of these PDFs are for the first edition of Pathfinder and the savings run through December 30th. Don’t forget a percentage of your purchase benefits Rancho Obi-Wan.