How do I get birth control with my mom knowing?

I am 18, I still live with my parents, and am not currently going to school. I am graduated from high school. My boyfriend and I have been together for almost 2 years and have been having for almost all of our relationship. We normally just use the pullout method but everyone knows thats not always effective. But we're a little low on money because he doesn't have a good job and neither do I, but we buy condoms when we can. I would like to get on birth control but only if I can get it without going to the doctor, without using my parents insurance, and if it's cheap or even free. Is there any way I can do this without my parents finding out?? They don't approve of having before marriage under any cirstances including birth control. So is there any way of doing this at all? And if your going to say "tell your parents" save it. I will not ever tell them. End of story. Oh, and my mom works for WIC and the CAC around the area that we live in, would this cause additional problems? Would she be able to find out through there?