Some grocery stores sell bulk un-packaged dry food items, these can be a huge savings. As long as you have somewhere to store the products, you can see savings. The bulk items usually are purchased in very thin plastic bags, so they need to be stored or used quickly. The cost savings from not having all of the packaging is passed on to you, which is how the costs are kept low. This is especially good for dry goods and unique products (where you only need a little).