Actually Leanne, when dropshipping the shipping cost is not yours to think of, since your customers will be paying for shipping. Remember that when dropshipping the products are shipped directly to your customers.
It might also be good to mention that your products or the particular product they bought will be coming in from the US let's say just so they know what to expect in term of shipping time.
Like Marc mentioned in his post, now might be the best time to give this a try with the current strength of the Aussie dollar to your (and your customers) advantage :)
All the best!