Ever stuck scrambling to find someone to watch the kids? Scramble no more with Wondersitter, an on-call San Francisco-based childcare agency. Rated 5 stars by Yelp users, Wondersitter provides reliable, competent and caring sitters at a moments notice (all thoroughly checked out by Wondersitters 7-step vetting process). Your two gift certificates for four hours of childcare from Wondersitter also cover the booking fee.