I'm shipping them in a tight cardboard sleeve. I think the shipping weight is 1lb9oz.
What I need is an EU or even UK warehouse so I can take advantage of the sweet, sweet cheap subsidized shipping. I bet it'd be 10USD to ship from the UK to AU. The most cost effective way to do THAt is to actually print a round of books in the EU but that's a stretch right now.
Part of the catch to all of this is that the warehouse I work doesn't do postal service at all, just Fedex and UPS. I balanced the pros and cons and let them handle the international shipping--it's pricier but it gets there in a week instead of a month. It's also unrealistic for me to keep up with shipping on my own.