The weakening Australian dollar makes overseas purchases less enticing, though there are international retailers that don't charge in US dollars that are mightily competitive with local stores. Hong Kong-based eGlobal is one example and with it currently offering free economy shipping, now might be the time to pick up a new lens, or even camera at a discount.
Spotted by OzBargain user scotty, the deal is running all weekend, though there are a few caveats.
The big one is that it's only for the first 280 customers. It's also economy shipping — if you want something faster, you'll have to cough up the full postage cost.
Finally, you'll have to use PayPal to make your purchase, otherwise regular shipping prices apply.
Still, it saves $35-$45, which is a nice. At the time of writing, the 280 slots are yet to be fully expended, however, there's no way to tell how many are left. So if you're keen, best not to wait. All the terms and conditions can be found on the promotion page.