Previte's is known for choice cuts of meat at wholesale prices, but it's the prepared meats - marinated steak tips, for example - that have people cramming into the store and waiting for parking spots on Saturday afternoons. There's also a Jordan Brothers Seafood and Fratelli's Bakery under the same roof. Previte's began in the 1940's as an East Boston Italian grocery. In the 1960's, it moved to Quincy, where it stayed until this shiny new facility recently opened.