AppSec California is the first of hopefully many annual conferences hosted by all of the OWASP California chapters. They have a decent list of speakers, so I'll be going there as it's in my area.
$25 for students, $50 for OWASP members, $100 for everyone else! After December 15th, pricing goes up to $30, $100, and $150 respectively.
Purchasing an OWASP membership while registering will give you a $50 discount, offsetting the cost of the membership.