Is it permissible that the price of the recommended sacrifice (Qurban) to be sufficient in such a way that…

Is it permissible that the price of the recommended sacrifice (Qurban) to be sufficient in such a way that there is a price for meat, neck and liver, where the total cost of these parts is collected and paid to the butcher? Or, should we buy an entire animal with a lump sum price which the two parties agree upon?