Can combine ship .50 cents each additional up to 4 total, maybe 5 depending on weight. Over 16 ounces will ship $7.95 to $8.95(padded) in a Priority Mail flat rate mailer for up 10 comics or so. WILL NOT SHIP MEDIA MAIL. Quantities over 10 or that will not fit flat rate mailer will ship priority mail boxed.Shipping cost will vary from $9.95 to $13.95 depending on total weight and destination.Ask for invoice before paying for multiples. Thank You.