Lately I am losing money when it comes to shipping costs, when customers put multiple cards in their cart. I specifically say that they can purchase three cards for one low shipping fee...and to contact me for a quote for bulk orders (also stated under policies...which I do not think people read.) But when they order more than three cards, the package weight goes up, and my shipping costs go up. How do I handle this? I don't want to have to charge more for each card; and if I charge extra for each extra item in cart, then the customer is paying more when purchasing under four cards...it doesn't seem fair. I think Etsy needs to set up shipping costs a bit differently...so there is an option for sellers to have a shipping cost for three items in cart, let's say; and then another cost for additional items.