How much does it cost to fix an oil leak? (It's leaking out the bottom).?

if this is a ford could be the oil pan 300to400 or could be rear main seal 400 to 500 or could valve covers leaking down the sides making it look like the oil pan need to know what kind of car.and year for better answerHow much does it cost to fix an oil leak? (It's leaking out the bottom).?
First off , you need to tell us what you are working on , and help us by telling us where the oil leak is coming from. Oil pan/ front or rear seal/ rocker cover gasket/ timing cover? Only a few mind readers out here , and most of us won`t just assume where the leak is from. Not all of us drive the same vehicle as you .