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You can select from Groceries, Health & Beauty, Home, Baby, Toys, and Apparel. Just click one and you'll be taken to the product list of that item class. This will display all the items listed under that specific category. If you want to shop by store, click the "Store" button on the upper-left corner of the page and select from the list of participating stores in the drop-down list where you want to shop. This will show you all the items you can buy from the specific merchant/store you chose. Once you've found the things you want to buy, select the item, and click on the "Add to cart" button.
Select from the Item Classification on the upper-left portion of the page the kind of merchandise you'd like to see. Choose the kind of items you like from the Category panel on the left side of the page. Shop by store. Add the item you want to buy to your cart.