not usually. these were in a Chinese-owned "asian grocery" near me with mostly imported stuff. i wonder though, maybe in california theyre in some of the chain stores, i dont know.
I dont remember, it was at a potluck party. the Chinese grocery near me sells Boy Bawang.. they used to have Sarsi too but now its just the Taiwanese brand Hey Song.
your new avatar confused me- i thought you were universal jellyfish! eh what's that filipino dish w/pigs blood? danugiwan? ive had that, i like it! spicy.