I LOVE TO COMBINE SHIPPING ON MULTIPLE PURCHASES BUT YOU MUST NOT PAY UNTIL I SEND YOU A REVISED INVOICE REFLECTING THE DISCOUNT. PUT ALL YOU WANT IN YOUR CART AND REQUEST COMBINED SHIPPING INVOICE. I CAN NOT COMBINE SHIPPING AFTER PAYMENT HAS BEEN MADE. SHIPPING INCLUDES POSTAGE, TRACKING # AND COST OF SUPPLIES (bubble wrap, plastic bags, envelopes, tape, paper, ink, etc....)