Any shipping within the US will be via USPS Ground Advantage with insurance.  I will be happy to combine shipping if you purchase more than one order; however, it is best to drop your choices into your cart and hit continue shopping.  Contact me then for a revised invoice.  I am also able to take a list of what you want and make a special Ebay listing for you to combine shipping.  That way you only pay for the weight of the package and not what Ebay would consider for shipping.