Teaneck never had a ShopRite, but there are 2 in neighboring towns (one in Englewood and one in Paramus). Teaneck does have a Stop & Shop. All 3 stores have large kosher sections, including meats.
Here are other Jewish neighborhoods in NJ with a ShopRite:
Edison (also serves Highland Park)
Livingston
Elizabeth
Cherry Hill (I believe it’s one town over)
Howell (as mentioned above)
I think one of the issues is the type of people who live in each area, and what hechsherim they trust. Yeshivish and MO usually have no issue with the “Big 4” – OU, OK, Kaf-K, and Star-K. Chassidim, on the other hand, usually prefer the heimish hechsherim, and don’t like to rely on the big ones. So in a community like Monsey, which became mostly chassidish over the years, ShopRite can’t provide what people are looking for. In MO communities, or even close to Lakewood, as long as ShopRite carries a selection of Chalav Yisrael products, they can provide for the population there.