✔ 最佳答案
I always mail skin care products to Australia via Hong Kong Post for many times already (over 1 year). Australia do not charge extra customs/duty for skin care products.
Mostly I use registered mail. I think it is safer if you just post it via registered mail, because it requires recipient's signature when it is delivered and because you can track it online via Hong Kong Post website.
The most expensive one I mailed before is HK$1500. I think you can try using registered mail. It's very reliable.
Other websites for your reference:
Hong Kong Post
www.hongkongpost.com
Australia Post
www.auspost.com.au