Shipping stencils out is expensive. I had one lot to canada "almost" go missing on me. Now i only quote shipping with tracking and signature. Cost via Aus international post is nearly always just under $80. Personally, i feel this is far too much to be charged for shipping and often it kills an international sale.
But for $80 i make nothing and for this shipping amount, i make the box, wrap the stencils in shrink wrap, pad the ends, tape up like a gimp on  holiday and then drive to the post office. Im always suprised at how much time this takes me and often think that i should charge a packing fee. I never do of course and so this becomes part of a "service"... aah yes.. service.. somehow this all got lost in the world