NBA store never got back to me in regards to international shipping and payment details. Ive ordered from Eastbay in the past a few times. Usually more hassle than its worth. I used to send a bank cheque now they only take Western union with all their fees.
Do you know anywhere online that does credit card or paypal ?
If you go through to checkout at NBA.com and enter in your details, the shipping price to Australia will come up (just don't complete checkout!!!) the form should also remain in place so that you can keep checking out the shipping cost on other items.