T.F.
My mother in law is a self employed personal trainner. She works at a place that she is able to set her own schedule so that she can be home with her daughter after school. She offers trainning two nights a week also while my FIL is home. Maybe you could look into something like that.
Good Luck, from a fellow SAHM to another I truely believe that sometimes being a SAHM is harder then working outside of the house fulltime. Don't listen to the rude remarks that people have to say because in most cases they are just jealous that they can't stay home with there own kids or don't want to say home them and feel guilty.