I don't understand what right a state has to tax out of state purchases.

Amazon has plenty of "unpopular" items for sale. I recently bought this book, have you ever heard of it? It was published some time in the 50s.

http://www.amazon.com/gp/product/B000PKC1KW/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

Maybe a new business of marketing for authors will open up to help publicize their works, I don't know.