Aside from the documentary DNA of GSP, there is a photographic book with quotes
based on the doc. Saw it at Indigo (Canadian bookstore), it's 28 bucks. If you're a GSP fan it'd be a good souvenier, or something which would be good to have signed by him if you are going to a signing of his.
Book definitely nothing compared to his autobio "The Way of the Fight", which was amazingly good.