Hi Terri, Not sure how good this agency is - but have you checked them out? http://www.momsquarednanny.com/for-nannies/

Sittercity.com seems to be all over the advertisements in your area for nanny's and I see a few direct listings through our friends at indeed, but most seem to be fairly low wages. I saw weekly rates of $150-250 - seems pretty darn low to me for the work. But maybe I am misunderstanding the amount of hours/week associated with it.
We actually have an initiative to get more matching for home services on here, so stay tuned. hope the above agency, or thumbtack.com (my new favorite gig-site) or sitter city might help out in the meantime.
Good luck! Fred

Hi Terri, Have you checked out care.com? A lot of people who are looking for nannies post them on that site. You can also make a profile and they may contact you directly for more info about yourself. Good luck!