How much to replace an ac condenser and add freon? There is an leak in the system

Has a test been performed to see where the leak is coming from? Have you verified an active leak at the condenser? You can check the Estimator tool on RepairPal: www.repairpal.com/estimator But it may not be in there, or may not be complete. Might be better to consult some shops near you for a real world quote: www.repairpal.com/repair-shops