Hi Athman. Using the internet to market (e.g. email blasts, Facebook, Twitter etc) is an easy and inexpensive way to get the word out. Participating in a local health fair, or other civic event is another great way that costs very little. I would also not ignore your friends and family. For each friend or family member that you ask to help get the word out, ask them to ask that person to spread it to 5 more and so on – amazing how fast this can grow!
I hope that this helps.