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If you truly want to publish a book for zero dollars, here is what you do. Write a book and convert it to a pdf. Then you can sell it on sites like Clickbank and even Amazon. You set the price and they keep a portion of it. There you are, done.
Of course for zero dollars you will have to be the writer, editor, proof reader, publisher and do all the sales and marketing. Publishing a book is easy--I have four published. Getting someone to buy your book is the real challenge. The best way to do that is to start writing a blog and get some followers. Then when your self-published book is done, you will already have a customers for it.