ShopRite has long been a major name in New Jersey supermarkets, but recall that in 1975, the cooperative was reeling from the loss of Supermarkets General, which in 1968 had split off and become Pathmark. It, of course, would go on to more than recover from the loss, but in 1975 the cooperative was definitely still trying to regain members and market share. In the metro New York market, by the mid-1970s, Pathmark was near the market leader, which it would become by the end of the decade (and then, if I'm not mistaken, lose the title to ShopRite in the late 1980s).
In 1975, ShopRites were located in Hillside (where the current one is), Clark (replaced by the existing store in the 90s), Millburn (which recently went through a renovation), Union (now Second Avenue since the store moved to Route 22), and Colonia -- although I'm not sure about whether that's before or after it was a Stop & Shop (later Foodtown and now The Fresh Grocer). Although ShopRite still has a large presence around the Elizabeth area, including an Elizabeth store that opened in 1991, tomorrow's chain has been long since gone from the region -- and gone entirely.