I used to have a page that summed it all up but cannot find it.  Take all of this with about 10 grains of salt as I have not published :D

Are you talking Ebook or Physical or both?

Here are a couple of links.

Kim Kommando has a couple of brief items: http://www.komando.com/coolsites/index.aspx?id=9129 and http://www.komando.com/columns/index.aspx?id=11802&page=1 The latter has some links to some physical book publishers.  She links to http://www.epubbud.com/ which seems (not sure though just briefly looked) to sell inexpensive ISBN and publishes to the major ebook groups as well as sells directly, not sure if DRM unless you have it go through the major groups.

http://www.underwatersamurai.com/forget-kim-komando-heres-how-you-self-publish-in-2012/  someone who gives some marketting and other advice.

EPub Editor/Creator that is free http://code.google.com/p/sigil/

This is part of Amazons self-publish part.  Be careful which section you choose and how much you ask for the book.  They return up to 70% in the right price range, outside that range it drops to 30% This also has a link to an EPub Validator that makes sure nothing is going to cause hiccups.  https://kdp.amazon.com/self-publishing/help?topicId=A2GF0UFHIYG9VQ