I used to buy rolls of thin foam sheets. I think it was just from office works.

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I get mine from Box n go, it is free delivery on orders over $50 and under $300 (not sure why the 300) and it takes about 2 to 3 days if ordered before 2pm to Melbourne. They are very good at updating you on status, and the boxes, bubble wrap and packing tape  are good quality IMHO. Boxes are as sturdy as Aus post and much cheaper. Hope this helps.