I’ve never seen those. Maybe they don’t ship to California?
They are made in Philadelphia and started out as a regional candy. If you want to sample just one and you have family/friends in the east coast region who would send you a sample, they are usually to be found in the Wawa convenience store chain. Otherwise, I think Amazon sells quantity orders.
They are so delicious because the peanuts are coated with molasses-sweetened nougat, encased with dark chocolate. They have lately been making a milk chocolate version, but the dark chocolate offsets the molasses better, IMO.
Maybe they have developed some distributors out west. Here is their web site: