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iHerb has shipping via DHL express (2 - 3 days delivery) starting at USD $8 / AU $10.50. I always prefer using DHL Express and paying the extra $4 as its insured and if the package gets lost, they will refund you.
With the $4 Option, if it gets lost, then its lost.
From email:
Enjoy an extra 25% OFF all of our DHL Express shipping rates, starting as low as $8 (Approx. AU$10.5).
Also consider buying quest bars in multiple of 4's to get 12% discount and then an additional 5% off that for orders over $40. Cheapest ive ever found them online was $33 plus shipping.
Enjoy