These official Lego storage bricks are pricey so far as storage in general goes, but these are great for the novelty of large Lego style bricks that fit together (like Lego itself).
These prices are the cheapest I've found in Australia and appear to be further discounted (Note that there wasn't a start or end date on these "special" prices.)
Lego Storage Brick 1 - $9.50 (was $20)
Lego Storage Brick 2 - $14 (was $25)
Lego Storage Brick 4 - $18 (was $40)
Lego Storage Brick 8 - $33 (was $60)
Most combinations I tried seems to be a flat rate for shipping - starting from $7 (Sydney) to $25 (Perth/Hobart) as high as $38 (Darwin).
For what it's worth, these are Peters' regular prices so no need to rush. They did have them in one of their daily deals a few months ago for around half of that again. Never having seen them at the time I was unsure of the sizes, so hesitated, and well, the rest is history.