Medi-Mart was admittedly a drugstore, not a supermarket, but this 1975 ad from an issue of the Daily Journal features the Stop & Shop-owned chain's Garwood location, located in the same strip mall as the Garwood Stop & Shop -- later Kings.
In fact, the ad even proudly proclaims the store is "next to Stop & Shop"! As we can see, Medi-Mart sold a variety of products, from drugs to cigars, home goods to ice cream. I don't know much about Medi-Mart, though, since its life and death were all before my own. But tomorrow we're looking at an ad for a supermarket we're all very familiar with!