It also never hurts to contact local churches, even if you are not attending, they will many times be happy to refer you to programs for low-income families. I found my current therapist through Catholic Charities- and I'm not Catholic :) But they are wonderful and kind folks over here, and helped me out tremendously to get cheap therapy.
Also, I'm told there are "sliding scale" programs through your state/city government that can be accessed and are based upon your income.