M.J.
What about in your neighborhood? Are there any candidates there? I've also found sitters through people I've met at the health club. I got to know the woman and then met her daughter. I've also found them through church.
Just get the word out. I found that as soon as I started telling people I was looking for a sitter, lots of suggestions popped up. I didn't follow all leads, sometimes I just smiled and nodded my head.
Good luck!