Cal Scale Windshield Wiper Single Arm, 2 Pair. HO Scale. Stock #190-517. Multi Purchases Click add to cart, not buy it now, and then ask Ebay to send the seller a request for a combined invoice in order to reduce your shipping". Must use Laptop or Desktop Computer as reported doesn't work on cellphone. We Combine Shipping. If you are unable to combine shipping our last resort is to refund the extra. We are only looking to try to come close to break even on shipping charges as charges us a fee on shipping, sales tax, plus item, plus 40 cents per invoice and the cost of the shipping container. Thank You for Your Business We appreciate it. Thank you for taking a look at our items. We are for 100% customer satisfaction and if a problem arises, we will handle it as need be. On multiple purchases let us send final invoice so we can adjust shipping and handling charges down as we try to combine shipping to lowest cost. All New items carry original manufacturer warranty.