I've found the interesting website lulu.com where regular people can get their manuscripts published into real books and sell them on the Lulu website as well as Amazon.

So I set up an account and even have an ISBN number for my new project, which is an introductory algebra textbook. Below is a tentative outline for the sequence of topics I want to cover. If anyone reading this has any feedback on the content and/or order things are in, I'd greatly appreciate it. Just by way of back-of-the-envelope...