Does anyone know anything about Xulon Publishers or used them?
http://www.xulonpress.com/how_it_works.htm
http://www.xulonpress.com/how_it_works.htm
You might want to check their prices/services against iUniverse or Lulu. If it's nonfiction you're writing, you'll ned to then balance that cost against how many you might sell in the back of the room. If it's fiction, of course, POD is the kiss of death; you might try commercial publishers first. Hope this helps!