i've had sushi from whole foods. they have really delicious brown rice salmon avocado rolls. they're really filling as well for just the 8 pieces. mmm...
i get my brown rice sushi from whole foods too! they have a great variety. i like the shrimp tempura brown rice rolls from WF, not as healthy because of the tempura but oh so good.
i haven't seen brown rice sushi at very many restaurants