If "Eastern Pennsylvania" means your close to Philadelphia, Calumet is a good "walk in" source. My personal suggestion to anyone starting is to purchase Kodak liquids and mix them in distilled water. Get a "Kodak Black & White Darkroom Dataguide" at the local used book store and use T-Max developer, Kodak Indicator Stop, and Kodafix fixer. These products have amazing shelf life. Keep in mind that all the other brands are quality products and are worth purchasing. Nothing in the above should be considered as a criticism of them.
Good luck and welcome to a rewarding way of making images,