New Registered AirMail Shipping for Buyer of Unlock iPhone Card

We refined our Registered Air Mail Shipping for our buyer of unlock iphone card, And the buyer will choose which shippment he like, DHL or Registered Air Mail.
Of course, it will reduce much fee for buyer. For DHL, it will cost about 39.99 USD for one peice Card Shipping(25USD DHL shipping fee,14.99USD for Card), but for Registered Air Mail Shipping, It will Cost only 19.99USD(5USD shipping fee,14.99USD for Card).

I think it is a two win business for Buyer and seller.