Unless you actually state a specific cost in the Shipping and Handling part when typing the listing, a buyer may be able to change the cost at checkout.

I recently bought an item from overseas and they had a number of locations listed in their Post To locations but only one shipping option was listed in Postage and Payments - which was their country. So, the Postage cost to Australia said: "Read item description or contact seller for details."

In the description of the item they put the costs for international shipping. When I went to checkout and pay, I was able to type in a shipping cost but not wanting to type in the wrong one, I simply requested an invoice. This was the first time in recent memory that I can remember having the option of typing in a shipping cost.