A few weeks ago, a local Berkeley, CA judaica store started selling kosher sushi from its shop.
Afikomen Judaica in Berkeley, CA has started selling fresh kosher sushi on Thursday and Friday made by L’Chaim Sushi of San Francisco, kosher certified by Vaad Hakashrus of Northern California, which is also sustainable certified by Seafood Watch. Delivery is also available locally.
See their Facebook page for more info.