The wheel speed sensors are made into the wheel bearing hubs. This site has a search estimater that is set to give you the average parts and labor for repairs. It works good and is specific for the average cost for your area where you live. Its at the top of the page just click on estimator...then put your cars info in and find wheel bearing replacement. It has both for front and rear so you need to check both because until diagnosis is done you do not know wheather its a fron or rear that is bad. You can also check on ABS diagnostic fees since that needs to be done.