Yes! If your order hasn't shipped yet, you can place an order and use the coupon code CombineOrder to have the shipping charge taken out. Before you check out, you must enter the order number of the existing order so we can find it to combine them. 
If you do not include the existing order number, or if you do not have an existing order, you will be invoiced for any shipping charges that were taken out as a result of using the coupon code.