You will find that the related charges are mostly the same for one box...or ten thousand boxes.( excluding the actual freight charge based on weight not volume).
Again, to make the excercise economical you will need to buy considerable volume, not to mention making a considerable financial outlay.
Even then your local market moans over the cost of the product.
Many before you have been through this excercise, but have dismissed the idea due to the large commitment required...

Best
Eric