supermercato or local groccer
the supermercato in Sardegna has very good quality and good variety. But for fresh fruitti da mar (seaffod) try a local fish shop. Take time to speak to the owner if you can and ask about local varieties. They are usually cheaper and better tasting, as the locals will use it for their own cooking. Try something new... and have fun!!! Sardegna is a wonderful isalnd with very freindly locals, BUT only if you aren't rude and respect the way of life there.