Hi Sue, When are you planning to move? And are your children ready for school, this year or next, and if so, what level? If what you want is a public school in Los Angeles, the LA Unified School District is developing a program in IB, but they're not completely there yet. Check out the LAUSD website page for info on IB Interest at: http://notebook.lausd.net/portal/page?_pageid=33,1158677&
If the Pasadena area would work for you, there is an IB elementary school http://pusd.willard.schoolfusion.us/
and high school http://www.blair.pasadenausd.org/.
Is Private School an option? If it is, there is a Lycee Francaise on the West Side of LA that is an IB school, and has great neighborhoods close by.
You can also search the ibo.org website for more info.
Let me know if you need any further assistance.