Young Master,
I am from across the mists, but I have many couriers who work for me. If you are still in need please let me know and we will find a way to accommodate you. My normal rates are 1.5x production so a potion that costs me 4 silver to make (cure mortal wounds) is 6 silver for you to buy. If you buy 40 or more I will move the price down to 5 silver each.
Many blessings,
BtB