Pork belly in Santa Barbara
Here we go off the top of my head: Try Gary Laird Butcher in Santa Paula because he is a real meat man. http://www.lairdsbutchershop.com/Home...
Or ask Julienne where they get theirs - they love pork and they love pork belly.
Ask a the Indochina Market in the K-Mart Shopping center who seems very wired into all things Asian. An their customers as well - they would love to talk about this I am sure if they have found their own favorites.
Gelson's seems to be the best mainline grocery store for special orders.