I am looking for ways to market my book on a zero dollar budget?

[Joss]

The question is: Why did you self-publish when you don't have any money to market, promote, and advertise your book? You NEED money in order to make people aware that you and your book exist and give them reasons why they should buy it.

You've most likely done all you do as far as "free" marketing goes. Get a blog and start linking to other writers and making comments on those writers posts (not spamming, but REAL comments about the post). Every time you post, your name will link to your blog where you have info about your book. You have to give people a reason to buy a self-published book by an author they've never heard of. Who is most likely to read your book? Do you know this information? Find out who is most likely to read your book (don't say "everyone" because that's not true and shows that you didn't even bother with marketing [trying to find the demographics] before publishing). Go to the places where your typical reader is most likely hanging and start handing there, too. Many forums will let you put a link your signature, so put a link to your website or blog where people can find info about your book. Try not to make it look like one big advertisement for your book, because many forums have rules against advertising. Also read the forum's guidelines about linking because some don't let you link to a commercial product.

Otherwise, you want something that one can really only get with a real publisher. This is something you should have thought about BEFORE publishing.