A fellow member shared this information with me in a post on the VBAC community group site. I hope it helps you ladies too.
Hello ladies, I hope you don't mind me jumping on this thread. I am a birth doula in Illinois (and also a member of the May '09 Birth Board) and wanted to let you know that most doulas are more then happy to work something out if $$ is tight ( a discount, payment plan, bartering, etc.) Many doula-in-training will do births for free or severley reduced rates. I know that doulas with DONA aren't listed on the web page until they are certified but you can call (888) 788-DONA (3662) to find doulas-in-training in your area. Also, I would check out Operation Special Delivery at their website, http://www.operationspecialdelivery.com/ if you are a military wife. They provide doulas for mom's whose husbands may be deployed during their baby's birth.
Best of luck!