Custom Vanity License Plates for California residents

As of this writing, they cost about $49 and take up to 4 weeks to arrive.
They can be shipped to your preferred California DMV location or to your mailing address.

FAQ and How-To:
http://www.dmv.ca.gov/pubs/brochures/howto/htvr24.htm

Order ONLINE at:
https://www.dmv.ca.gov/ipp2/welcome.do

Or use the MAIL FORUM, which also includes all the details:
http://apps.dmv.ca.gov/forms/reg/reg17.pdf
This forum is always the most current form available from the California Department of Motor Vehicles.
Check the bottom-right of the form for its revision date.