Under the "International Postage" section when editing an item:
1. Select "Flat rate cost to all buyers".
2. Under "Post to" select "Custom Location"
3. Tick the "United States" checkbox.
4. Enter a value of $14.10 or higher if it's a heavier item.
Save the changes.
Use the Australia Post postage calculator to determine the cost.
Always add in 50 cents to a dollar to make sure you're covered when eBay takes their cut out of the postage amount., and if you charge for packaging supplies and handling.
