Since you are operating a business service, you need to ensure that a) it is legal to take that item across that border, and b) The relevant fees are paid for an import business (not for personal use)
It doesn't take a lawyer to see that you'd be in trouble for not following the laws of the land your couriers are traveling to. But you do need to run this past a lawyer (and probably a set of lawyers, one for each jurisdiction) before you get one of your couriers thrown in jail.
It is possible to run this legally, but then the process won't be as cheap as I think you're expecting it to be.