100 octane in So.Cal. listed here, but prices are higher than shown here. Call locations to verify.
http://m.6speedonline.com/forums/sho...051&styleid=28
http://www.davebarton.com/Unleaded_Racing_Fuel_in_SoCal (more up to date).
http://goo.gl/maps/UiBt7
Google map of locations in 2nd link.