What is an estimate of how much it would cost to replace a ball bearing on a 1998 Audi A4 2.8 litre Quattro?

It sounds like mine is going bad, and I'm sure it'll have to be replaced soon. I'd like an estiamted cost if anyone has been in the same shoes as me.What is an estimate of how much it would cost to replace a ball bearing on a 1998 Audi A4 2.8 litre Quattro?Any idea where this ball bearing might be?What is an estimate of how much it would cost to replace a ball bearing on a 1998 Audi A4 2.8 litre Quattro?my rear left bearing is going bad i have an appointment for next friday to get it done on a 01 1.8T quattro. The mechanic i go to here in New Hampshire gave me an estimate of between $190-230