I know someone who as asked to collect plants from the wild be PP... I will not say who, but if memory serves, it made the rounds here in PM's a long time ago, back in the beginning of the forums... you would have to be a real old timer to remember. The way I see it, why give money to them, when you can give it to someone who actually cares about these plants.
Savage Garden is the only bible you need for this hobby. It will entrench you in the basics, everything else, you can learn here.