(a) shall dispense the lowest priced substitute drug listed in the formulary at the price listed in the formulary plus that person's normal dispensing fee; or
(b) shall, if that person does not have the lowest priced drug, dispense another drug listed in the formulary as a substitute for the prescribed drug,
(i) at the price of the lowest priced substitute drug listed in the formulary plus his or her normal dispensing fee where the lowest priced substitute drug is generally available within the province, or
(ii) where the lowest priced substitute drug is not generally available within the province, at the price of the lowest priced substitute drug that is so available plus his or her normal dispensing fee.