Hi there! Thanks for your interest in this event so soon! At the past expos we haven't had books for sale at the Penguin booth. That is simply because books are far too expensive to travel because of their weight. We probably couldn't sell as many of the other great tricks if we added books to our table. The same goes for our other vendors like Mark Mason and Chris Smith, who also want to demonstrate as many of their killer tricks as they can.
As for your second question, YES we're happy to accept credit, and our other vendors do as well.