Im looking for a similar solution, but maybe in a slightly different way.
I would like to have a drop-down on the 'cart.php' page that inserts the correct shipping price before going to 'checkout.php'.
I would prefer this solution as some of my clients use PayPal Express only.
I have set up a session value called 'Destination' and have a drop-down inside the cart form called 'DestinationChoice'.
There are only 2 choices - UK Mainland and UK Offshore.
I would like the drop-down to update the form once a selection has been made and change the value accordingly.
I can set up the eCart Shipping calculation based on the Session Variable, but I'm not sure how to get the form to POST it in the first place?