Richmond New May Wah is perhaps the largest Chinese supermarket in SF, not in Chinatown. Located on Clement Street, parking is an absolute nightmare on weekends. But don't let that stop you from coming for their wide selection of all Chinese and Asian delicacies.
A few bonuses here - unlike most Chinese supermarkets, they actually take credit cards. Also, for those of you who may have a credit card that refunds you 3% to 5% for all gas purchases (vs only 1% for normal purchases), for some reason, Richmond New May Way counts as a gas station when calculating your monthly rebate.
Great selections, reasonable prices.