It actually costs more. Approx $14 to USA, Approx $11 just to get to Aussie!!
I send all my chips fully insured, and New Zealand Post will not allow any non-paper items to be sent as a letter.

I take a small hit as I currently struggle to sell anything due to the high costs.

Thanks

https://www.nzpost.co.nz/sites/default/files/uploads/shared/standards-guides/adv543-international-services-postage-guide-excluding-gst.pdf