There are loan products available for lower credit scores, if you have downpayment, work history and can show that you have the ability to re-pay the loan.
I would recommend speaking with a local active REALTOR in your area, and asking them for a referral to a loan officer who can assist you. I could refer you to someone locally in my area, but a California lender probably won't be of much assistance.
Good luck in your home search - if you'd like a referral to a local agent, I'd be happy to assist you, my contact information is below.
Tamara Stoebe, REALTOR, GRI, e-PRO, CHS, QSC
DRE License #01827461
Prudential Troth REALTORS
1801 W. Ave. K
Lancaster, CA 93534
Cell: (661) 466-6849
Fax: (661) 422-3006