If you're having trouble finding a copy of Christopher Moreman and Cory James Rushton's ZOMBIES ARE US: ESSAYS ON THE HUMANITY OF THE WALKING DEAD, Amazon has a few copies through their marketplace, as does Barnes & Noble.
Alternately, you can order a new copy directly from the publisher, though the shipping is "McFarland Standard" and only costs $2, so I'm guessing it won't be speedy.