at Mozilla Store
According to Mozilla Store's shipping info
page, and this RTF document on shipping detail
in particular. One T-shirt would cost customer US$109.81
for total cost to Australia.
1 Tee Shirt valued at $14.95 USD, shipping to Australia:
Order Value $ 14.95
Freight Charge $ 66.82
Duties and Taxes $ 17.99
Total Delivered Order Cost $109.81
I really wonder any rich Firefox supporters in Australia is willing to pay US$109.81 (+ 1.5% to 3% exchange surcharge on credit card) to buy one T-shirt that only worth US$14.95.
(Based on the linked RTF document retrieved at time of posting.)
Also, goods under AU$400 value is free of custom duties.
UserAgent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/412.6 (KHTML, like Gecko) Safari/412.2