as an active GM for Paizo's Pathfinder Society organized play great to see the Pathfinder love on Massdrop. Worth noting that Paizo sells ebooks of all of their hardcovers for $9.99 (one of the true bargains in gaming) and further that most of the core rules (if not Paizo's settings books) are also available for free online under the Open Gaming License. These books are great - but if you are just curious about Pathfinder you can get started literally for free and then pick up the books you want as you go.