Use this item if specifically directed by us to purchase a custom shipping or service option.
Each shipping unit is $1.00 USD credit towards your special request. Enter the quantity equal to the price we quoted you in an email response to your shipping request.
Example: if we quote $39 then enter your quantity as 39 and click the add to cart button. NEXT you must enter the shipping method or service you are requesting in the COMMENTS window during the checkout process. Remember not all express shipping options are available to all countries.
http://pe.usps.com/text/imm/immctry.htm
Finally, select the Free shipping option on the shipping checkout page so you don't get too many shipping charges.
