Estimated shipping charges will be shown in your Cart.  Your order summary on the paypal page will not show shipping charges. After checkout, the page will redirect to this website, where you will see your final total, including shipping charges.

Shipping charges within the U.S:  $4.25 for the first item, and $1.00 each additional item, up to 13 ounces. Elsewhere:  Actual cost.  
You will be billed via paypal invoice request if there are extra charges for your location.  Buyer pays any customs fees or taxes.