Hi,
I've done some research on Customs in Australia. So if anyone from Australia that wishes to import stuff overseas, this is a good manual for you from the Customs. It makes things sound easier. Any purchase less than 1000 dollars, all you need to do is fill in Self Assessed Clearance Declaration (SAC).
Then again if your 'less than 1000 dollars' purchase is sent through post, the customs will clear it for you and they will contact you for what you must do next.
*Be careful though, multiple purchases from the same person at the same time means that they will sum up all the packages value and tax you if needed.*
If it isn't by post, then you'll have to fill in the SAC.
I guess one document wouldn't hurt. I just read a few sentences roughly. Here's the link to the PDF for Importing Declaration.
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Here's the link for 'buying online':
For more info on SAC, follow up this link,
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Hope this was helpful for fellow Australian newbies...
Have fun importing...