Here's a round-up of some of the SoCal libraries:
LA Public Library
County of LA Public Library
San Diego County Public Library
San Diego Public Library
Orange County Public Library System
Pasadena/Glendale Digital Library
LAPL and CoLA pretty much have 95% of what I read - stuff that's on NYT bestseller lists. Both libraries are also active in reading purchase suggestions, and typically add books 1-2 weeks after I suggest them. Thanks to them, I haven't bought a book in months, and the waiting lists are still fairly reasonable.