S.P.
D.,
Do you have friends that have regular babysitters or nannies? Perhaps you could do a nanny-share with one of them? This is a great way to cut costs too. I was a nanny while attending college too and I found most of my families by word of mouth or by college postings. You could call SJSU or De Anza College Child Development Program and fax over a job listing with your needs. Most of the people in these programs are studying to become preschool teachers or elementry school teachers, so the extra income is always helpful. For me, it was hard finding a family that could pay me what I am worth (trust me as a parent myself I know how expensive it could be) but, to find someone that is reliable and with experience you will have to pay a bit more.
Good Luck!