I am not sure why it's quoting you a different shipping cost unless you're ordering more mats/other products than they did so the weight would be more. The 5% for new customers doesn't apply to the group buy 20% off on Mats and Sunshades. (If you want to buy additional products I can deduct the 5% from the order afterwards and refund it. I can also take care of the 3$ in shipping costs on the back end after the order is placed if it's quoting you more than the 9$ the other customer quoted for only floor mats. Just send me an email or reply to the order confirmation email and I will make sure things get refunded back to you.