tutor children

I currently tutor children in grades 6-12 afterschool and on the weekends.  Many of my students are children of lower-income parents who have seen me tutoring kids at a downtown library and have approached me to help their child.  I do not charge alot but know these kids need my help and that sometimes it is difficult for them to pay.  I would like to be able to tutor other children in similar situations without overburdening their parents and be able to provide for my own family.