I post my flies all over the world - postage costs are as follows:
Australia $13.90 - Insured postage with tracking & signature on delivery
International Posted Airmail with registration & insurance.
Zone 1 (New Zealand) $24.00 Zone 3 (Singapore/ Malaysia) $24.00 Zone 4 (USA) $26.00 (Canada - no insurance available) $16.00 Zone 6 (UK / Ireland / Germany / Spain) $30.00 Zone 7 (South Africa/ Denmark / Poland) $33.00
If you purchase 2 doz flies or more I always throw a couple of extras to offset your postage costs!