Surprise, surprise! Some supermarkets these days sell seaweed! So go check your local supermarket. If not, go and visit the nearest Asian stores. They've got loads of seaweed but you'll have to check where the seaweed has been harvested. Some seaweed can be really cheap but the harvester might have not been as careful with where they harvest. Health stores are into seaweed and are particular about where the seaweed comes from.
If Asian stores or health stores aren't nearby or don't have what you're looking for, consider buying online. Our recommendations?