This is just so that googler's can find this information. The New Oriental Supermarket in Littleton MA is open from 10AM to 8PM seven days per week.
They are the typical low budget asian market, with no web site. It has the usual shelves of dried fungus, more shelves of dried stuff you can't recognize that is labeled only in Chinese. Several refrigerated units have recognizable and unrecognizable fresh vegetables. There is an aisle of various kinds of noodles and all sorts of rice. Several freezer cases are full of prepared dumplings, stuffed rolls, etc.
This will maybe save a few people phone calls or wasted trips.