Don't know if price is higher after pre-order. But can tell you shipping by EMS to Sydney is around 50-60 bucks. So for Melbourne I would imagine slightly higher since it's further south (but might be the same?).
Should be the same. International shipping is aimed at the country rather than state/postcode. I've been continuously buying stuff off eBay this past year sending them to Melbourne, and there has not been any differences with sending them to Sydney.