On the street, methadone costs an average of $0.50 per milligram. In some regions the cost can be double that, however. Price sometimes goes down when a person is able to buy a lot of methadone at once, with sellers cutting deals.
The cost of Methadone will depend on the amount that is being sold and your location. Selling Methadone on streets is illegal since you have to had a doctor's prescription in order to purchase one on pharmacy.