To lookup a retailer's sales catalog from your shopping list, you need to link your list to a retailer. On your Shopping list screen, tap on the "Deals" button as illustrated below. If this is the first time you are linking to a retailer, you will see a list of retailers that are close to you (Make sure you allow the app access to your location. You could also enter your zip code by tapping on the pin icon on the top right corner). Pick the retailer to which you want to link the shopping list, once you do this the retailer connection will be saved and you will see the retailers sales catalog in the following screen.