How much should timing belt replacement cost?

A dealer can charge from 460 to 495 dollars for all the belts, IE., Timing, alternator, A/C. However, you are not required to replace them under schedule maintenance before 90,000 miles. Dealers often suggest to have them replaced after or at 65000. That (65000) bench mark is for the Hybrid which has some thing called 'Interfering Valves system'. In a regular model the change is recommended at 90,000. It is a good idea, though, to check condition of your other belts periodically. If you notice excessive wear and cracks, then perhaps you may need to change all belts including the Timing belt, otherwise, change them at 90,000. I had them changed at 89,945 miles and the belts were still in good shape. Check the maintenance manual of your car. Good luck.