Top marks from a self-published author.
I am a self-published author and I have used Lulu for many years. They provide me with a free ISBN, (if required), and give me an Author's page on their website, from where I can sell my books directly to the public. And it doesn't cost me a penny. My only expense is if I require a printed copy,(copies), for myself. I set the price of the book and my royalty payment which they send to me every month. The quality of their printing is first class and they offer several different formats.