Leaving Megalopolis is an original hardcover graphic novel written by Gail Simone (Birds of Prey, Batgirl, Wonder Woman, Deadpool, etc) and illustrated by Jim Calafiore (Batgirl, Deadpool, Iron Man, etc.).
A Gathering Storm by Robert Jordan and Brandon Sanderson, signed by both:
A novel (Snyper) and novella (Murderous Row), signed by new author J. Merideth Harmon:
An anthology of connected stories - and a couple of poems - centering around a town full of superheroes and supervillains and a retired superhero who now owns a deli. You can have The Deli Counter of Justice autographed by one of the authors, if you like:
The hardcover of Leaves on the Wind by Zach Whedon, a continuation of Firefly/Serenity, signed by artist Georges Jeanty, who also drew a picture inside each book: