I bought all my clams locally.
You can buy lot of thing cheap in California until they get those thing on the ban list. Also, I got fed up with freshwater species ban list in California, 90% fish species I want to keep and they are on ban list...LOL
Tell me about it, Im next door in Nevada. No FW rays, Gars or piranhas. Well theres more, but those are the ones I remember because they're the ones I want to keep. Especially rays. But at least you got that bustling clam market in CA.