Looking for head-on shrimp for Thanksgiving. Any thoughts on where in SF or Marin to buy?
Try Tokyo Fish Market in Berkeley, Ranch 99, or Berkeley Bowl. Two good threads addressing this on Chowhound:
Chinatown seafood markets in the City
...or Japantown come to think of it might even be better.
Monterey Fish Market on Hopkins in Berkeley can order them if they are available. They often have them.