You can now get the Path of Shadows from Paizo's own web store, and now in print-on-demand format on DriveThruRPG so you can have a physical copy!
The PDF copy is only $10, and a printed copy is $15. If you get both from DriveThruRPG, you can get them for a total of $20.00 and save yourself $5! It's available on all of the following stores (though print edition is only through DriveThruRPG):