You set some kind of shipping offer based on items for customers and show in cart totals area on cart page. For example, you will give the free shipping offer when your customer will buy 3 or more items from your site. So small acknowledgement bar above the shipping calculator will notice the buyer how many items are left to get the free shipping offer.
I already published a tutorial(Offer Different Shipping Cost Based On Cart Items) how you will give the Free shipping offer based on cart items. In this tutorial I am showing how you will display the notice or message above the shipping calculator.
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