Delaware Valley Consumers' Checkbook used a list of 154 national-brand products to compare prices at the region's supermarkets and national chain stores that offer groceries. The table below shows how prices compare, using $100 as a regional average. Also shown are the percentage of consumers who graded a store as "superior" in overall quality and produce quality. Warehouse stores such as Costco and Sam's Club were excluded because of membership fees, and Aldi and Trader Joe's were excluded because they carry mostly private-label products. The full comparison is available through Jan. 15 at this link: https://www.checkbook.org/inquirer/groceries.