How much should a timing cover gasket replacement cost? on 2005 Buick Century

Had an oil leak so we had the oil pan gaskets replaced. Leak persisted. The timing cover gasket is now to blame and replacement for that and a water pump and a coolant kit and service is costing just under $600. Is that reasonable?

Asked by for the 2005 Buick Century
i think that is fair 500-600
Seems to be. I got a second opinion over the phone from another place that asked for more. Just seems such a shame to have to pay for two repairs for the same problem, but that's life.

Thanks, man.