Amazon, Barnes and Noble, Indiebound, or Audible.com. Or just harass your nearest audiobook purveyor until they stock it. I won't complain.
The DEAD HARVEST audiobook is read by Brian Vander Ark, whom a good deal of you may know from his time fronting The Verve Pipe. (C'mon, y'all can admit to singing drunkenly along to "The Freshman" after your buzz soured senior year and you got all maudlin and nostalgic about that lousy breakup three years back. And while we're on the subject, no, her making out with your roommate and failing to return your dubbed copy of Throwing Copper is not almost as traumatic as the song's suicide, so stop whining.) Many thanks to Brian for taking the time, and lending voice to people who, until now, existed only in my head.
5/2 UPDATE: There's a clip up of Brian as Sam Thornton at the Angry Robot mothership. Check it out!