Hi Nights Dream :)
My sister self published a book a few years ago. She has not sold a lot, but she is in the same boat as you: It just costs money to promote a book. She tried a few things, such as an ad in the New York Times which did NOT pan out as the ad only ran for one day and it cost her $1000. Huge loss.
It is hard to answer your question, after seeing what my sister has gone through. Her book is on www.amazon.com and titled "Subtle Deception." It is a very good book and it's a true story. She did sell some of her books at a Barnes & Noble book signing and at other book stores.
I'm working on a book. If I decide to self publish it, this is what I plan to do:
I will search for and sign up for any writer's conference that I can get to by car. Alot of these conferences have editors there, and you can schedule a 15 minute appointment with them.
I have found that if you meet with an editor IN PERSON, SHOW them what you have, and follow up immediately, there's a chance they will either publish what you have, or at least give you advice or suggestions. Example: I met with an editor at a conference, sent him my proposed manuscript and mailed it to him right away, reminding him I had met with him. I managed to publish three articles in their magazine after that.
Also, many writer conference organizers will let you put your book on a table with other books...Lots of times you can sell a few.
I have enough rejection slips to wallpaper my house, but I have learned i just have to keep going.
I know a couple authors who literally drove into a city and sold books from their car. They are very famous today. They had no other way or means.
I hope this helps. Regardless, DO NOT EVER GIVE UP. You have a talent. Use it, and keep going, no matter what.