18. An institution in the same region as the accredited bookstore where books are acquired or an institution that must acquire its books outside its own region because it has been proven after verification by the Minister, that a service of adequate quality is not available to the institution in its region, may not be billed for delivery, transportation or handling expenses.
R.R.Q., 1981, c. D-8.1, r. 1, s. 18.