According to an article from the Boston Chinatown Blog from back in September, it appeared that Sun Sun Company on Oxford Street was going to be closing at that time, with a message sent from the author of the post telling us this week that the market has indeed shuttered. A Chowhound post indicates that Sun Sun may have closed sometime in early October but an exact date for its closure is not known.
The Boston Chinatown Blog says that Sun Sun was "one of the first Chinese Supermarkets in Boston's Chinatown if not the first. And...one of the last old school style mom and pop supermarkets to last." The Manta site states that it was established in 1964, though it may have been even older than that, based on information from a Google search.
The address for Sun Sun Company was 18-20 Oxford Street, Boston, MA, 02111.
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[A related post from our sister site (Boston's Hidden Restaurants): List of Restaurant Closings and Openings in the Boston Area]