I used to prefer Peters Bros. Meats in nearby Lenhartsville, PA, but now favor Dietrich's. Their store made summer sausage and Lebanon bologna are LEAN, also so are other smoked meat sausages they make. They also make their own homemade frankfurters in several varieties, and classic whitish bratwurst, which is just great. Prices are steep, but quality is topnotch. They also have topnotch baked goods, such as shoo-fly and lemon sponge pie, and seedless non-caraway flavored rye bread, which is also great. They are just off I-78 about 20 miles east of Allentown, PA, and are definitely worth the travel delay. Don't worry, you won't get lost from I-78.
I used to buy their products in the 70's and 80's and they were five star plus at that time. Their summer sausage has become much more greasy when I recently bought it, after a number of years without visiting the ABE area, where I used to live, and their bacon has also become much more watery. The flavor of the bacon is still great, once you cook out the water. It's cured with brown sugar, and has a strong smoke flavor. I would pay more for leaner summer sausage, and less watery bacon. I have bought their products since the mid seventies, and sadly, quality has deteriorated from five star plus. They make good country sausage, but have never made their own frankfurter, which I have always wanted, especially in a natural casing.
Great place to buy meats. They have the best Smoked Sausage. We have lived in Florida for 12 years and have meat shipped down to us every year.