You can find an up-to-date list of production and shipping costs for all the products we offer at the link below:
Additional shipping cost? What does that mean?
Additional cost is the extra shipping cost for shipping another item of the same type within that order.
Lets say your customer orders 3 tee's the first one would ship $5.50(US order) then every additional tee would ship for $1.50 but if they were to buy a mug, tee and a phone case we would charge you full price shipping on each since they come off of different production lines and are typically shipped from different facilities.