I've quotated several nannys and a couple of California-based agencies, the
salary range is $2600-$3400 / 26 days plus >= 10% bonus. Certainly you also
need to pay the round-trip transportation cost from the nanny's home to your
home, unless the nanny will visit the next family when leaving your home.
The agency also charges a fee of $100 - $200 each case. Usually you have to
pay a deposit of $300 - $500 ahead of time when you book a nanny.