If I were to buy it, how much is it to proxy it to Australia? With tracking, or EMS. Is it expensive?
Likely a lot, depending on the weight. For example, a box that's 24" by 12" by 6" (just a guess) that weighs 12 lbs would cost $81 to australia, but only $60 for a 7-lb package.
I don't know what these weigh, but the above prices are for priority with tracking. Express mail (EMI) (3-5 days) is $78 or $105 for those weights.
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Edit: after looking it up, I had guessed the weight low, and the size wrong. These weigh at least 17 lbs and are 22.4 x 8.7 x 19.7 inches or so (according to amazon) I suspect the box is even larger than that, but the weight puts it at
GXG (1-3 days) is $192
EMI (3-5 days) is $146
Priority (6-10 days) is $110.60