Means a Ralph's, Trader Joe's, Kroger, Safeway, etc. and not a SuperTarget, SuperWalMart, etc. Basically a store where groceries are its only business.
Exactly, you are correct. For me in the Chicagoland area, Whole Foods, Jewel, Dominick's, and Trader Joe's result in a 6% off discount whereas Meijer and SuperTarget do not.