From the announcement:
We here at Aetherworks understand the concerns and high costs associated with international postage. There’s no two-ways about it, the Australian Postal system is expensive, and the nature of our building products mean that they have to be sent as large parcels via our postal system.
In order to provide some compensation and to let our international customers know that we are aware of these issues, for at least the next few months until we can find better alternatives, we will be including a special promotion for all international orders amounting to $50.00AUD postage or more of an exclusive Post Office building. The only other requirement is that these orders consist of at least 75% value in Aetherworks products (excluding postage).