An online store can make full use of different tools to make their site interesting and fun. This will not just make an effect to the buying experience of the client, but it will also be excellent on customer satisfaction. All of the merchandise you see in this website are from ebay and straightly linked to their individual ebay pages. Tapping over the links or the products you want would send you to ebay.
If you're buying a product that has a shelf life of around a decade like batteries, it wouldn't hurt to purchase these in bulk, especially if you replace batteries every month.