Available for free, no less, at the Paizo website. (Some mild registration required)
Oh, I could go on and on about what's great about it, but you know what? I have people for that. So, basically, I'm gonna point at Geek Related and go "Yeah, what he said."
Because I can.
Also, I'm lazy.
EDIT: After just over 9 hours of sales at GenCon, the Paizo booth is completely sold out of their Pathfinder RPG stock. And this is for the Beta version. If there was ever any question there was support for this game -- there's your answer.
The Fine Print
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