The Federal Education Budget Project has a great interactive map with data on federal funding, demographics and student achievement for every school district in the country.  Information is ranked for the country.  Some of the available items include:

• State Per-Pupil Expenditures:   Map | Analysis
• Student Poverty Rates:   Map | Analysis
• School Finance Equity:   Map | Analysis
• 4th Grade Math Proficiency:   Map | Analysis
• 4th Grade Reading Proficiency:   Map | Analysis
• 8th Grade Math Proficiency:   Map | Analysis
• 8th Grade Reading Proficiency:   Map | Analysis

There's also a researcher download, with information specific to California, and with detail down to the the District level.  Within the Bay Area, among the top funded, Palo Alto Unified at $11,028 per pupil.  Among the lesser funded, Franklin Elementary in Oakland, at $5,475.  There's also information on poverty levels.  Respectively for these two schools, these are six and ten percent.