I like the Maine Seaweed Company. I attended a presentation and slide show
by the guy who harvests the seaweed, really interesting. He is very mindful
of his work and harvests in such a way not to deplete the supply. He
carefully works in unpolluted waters.
You can request information d prices by writing to
Maine Seaweed Company
P.O. Box 57
Steuben, ME 04680
Usual disclaimers, no financial interest, etc.