H.
Hi K.,
I would try Sittercity.com. You have to sign up for a year membership, but you can also go on the site and look around first. I wasn't sure I wanted to spend the $$$ and sign up, but i did and it was soooo worth it. I found two really great sitters. They have background check info, and reviews (good and bad) from other parents. I think there was also a coupon from mamasource for 10% off.
Good luck :)