Twilight Forums

Try the Suncoast store downtown.

The Enlightenment Center at the desert is the equivalent of the hospital for PP. There are, however, more than 30 other ways to restore PP, you can find them all here.

The wiki is indeed one of the best places to look for these kinds of questions, IF you don't mind spoilers.

And, if you do mind spoilers, perhaps you could consider the Help subforum?