Ecrater does not automatically adjust the invoice when there are multiple purchases from one store. Email us after you have checked out and we will send you an email with the adjusted total which will reflect the new shipping fee. If you are paying with Paypal and prefer to pay at the time of checkout, I will refund any excess shipping fees that you have paid. Or you can let me know you will be paying with Paypal and I will send you a Paypal invoice with the adjusted total.
Sales tax is not added to your purchase.