For wine shippings to the USA in 2020 the break even point still lies at about 18 bottles or more, like in 2018 and 2019. That is: the price per bottle shipped at 18+ bottles will be Euro 11,12 per bottle in 2020.
This means a rise of "only" Euro 1,45 per botle compared to 2019, when it was Euro 9,67.
The insurance costs stay at 2,5 % over the value with a minimum of Euro 25,=.
Last but not least: as always, you do NOT pay the french TVA tax (20%) over the buying price of the bottle(s) here in France which of course sponsors your net shipping costs as always !.