I'm going to be in Plymouth this weekend and am looking for a place where I can buy sushi grade tuna; I'm going to be making a carpaccio, so it really should be a high quality place. I'm not familiar with the fish markets in the area. Surrounding towns are fine like Duxbury, Kingston, Hanover, Marshfield, etc. I also need to get oysters (serve raw) and scallops; I'd imagine that since I am in that area that there should at least be a place.
I live in Boston and am used to going to New Deal Fish Market, so that gives you an idea of what I'm looking for. The only thread I found on this topic talked about places North and in Boston.