While perhaps not quite at the summit of they pyramid of supreme health benefits of mushrooms, portabella mushrooms (portabello mushrooms) are still a great mushroom and have lots of health benefits when included in your jumbo shrimp and prawn wok recipes. You should be able to find fresh portabella mushrooms easily as they are now one of the most widely cultivated mushrooms in the world and reaily available. You'll find portabello mushrooms more easily than shitake mushrooms, for example. For convenience, you may want to supplement your supply with dried portabellas such as those from Amazon's Gourmet food section [Dried Organic Portabella Mushrooms
Fresh Portabello Mushrooms