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Digi Direct is 10% off this weekend. Cheapest I've seen this lens, cheaper than HK or US import and genuine Australian stock and warranty.
Next cheapest for Oz stock is Teds at $1181.
Please put "Contemporary" in the title as there are effectively two Sigma models of this focal length and aperture range, the Sport and the Contemporary. The difference is in the amount and arrangement of the glass used, and this model is inferior in that respect, but cheaper and lighter. Still, it's important to know the difference.