The cost of the document is calculated according to the notarial fee, that were passed by the Government on 1989, and they depend on the value of the real state and other circumstances, as the lenght of the deed or the copies that are requested. The notarial fee is equal for every Notary, that’s why every one of them charges the same for the same service. Each notary has at your disposal a full copy of the fee, to solve any doubt or question. You can check it here.