L.H.
I'm in a similar situation. I work 2.5 days a week and have tried to find a nanny or daycare who will accept children part time. It's not easy to find! Here are two agencies I called and liked--problem is the finder's fee is out of my price range.
College Nannies www.collegenannies.com
Nanny Professionals: ###-###-####
You could also post on college web sites such as St. Thomas and St. Catherines job listings. Good luck!