I still purchase pbooks. Not new books though. About a year ago I discovered a second hand book store not too far from where I live. It is run by the local catholic school and the place is jammed packed full of books.
I have been able to find out of print books, been able to complete pbook sets in my library, and discovered new books to read. I pop in once every few weeks. And it is unbelievably cheap. Either $3 or $4 per book. Spend $20 and I practically need a wheelbarrow to get to my car (ok slight exaggeration)