You can find raw nori sheets, but it has to say 100% raw . The way you know that they are raw, is by lifting them into the light .If they turn green they are roasted,heated, if they turn a purpley ,black color their rraw. You can also find raw kelp.

sea spaghetti is also raw:).

http://www.amlaberry.co.uk

I get my seaweed from this place and except for the prepared stuff, everything is raw. http://www.seaveg.com/shop/
Their dulse is awesome.