Very easy, we can get inspiration from the web shops 10 years ago (and still a majority of honest sites today) : the price of the item and somewhere close the b

Very easy, we can get inspiration from the web shops 10 years ago (and still a majority of honest sites today) : the price of the item and somewhere close the base shipping price and a (legal minimum size) link "shipping price" redirecting to a shipping price table. We can even impose the table framework like the nutritional information on food to avoid volontary complexification of that page.