Sunset Super is the closest thing San Francisco has to Ranch 99. This is the place to go for everything Asian food related. They have a great fresh seafood and fish section, as well as produce. And more importantly, a huge snack section where you can satisfy your cravings for Pocky, Pretz, and japanese gummy candies. And dried cuttlefish, but the latter might be just me.
Could be a little cleaner and sometimes there are some funky smells, but it's a small price to pay for good eats.