IllumiNet Press
First and foremost (from a Discordian standpoint, at least), the IllumiNet Press publishes the Principia Discordia.
      However, they also publish a lot of other really cool titles like The Mothman Prophecies, The Idle Warriors, Zenarchy and Visionaries, Mystics & Contactees.
      If you send them a couple of extra dollars and request that they send you anything that they have lying around, they will, indeed, send you something cool. Hell, they'd probably send you something cool even if you didn't pay extra for it.
      You can contact them at IllumiNet Press, PO Box 2808, Lilburn, GA 30226 or check out their web site.