1999 Nissan Quest Timing Belt

I have a 1999 Nissan Quest with approx 120,000 miles. Bought used, unknown if timing belt has ever been replaced. Was told it would cost approx $900 to replace timing belt and also that the water pump would need to be done at the same time. My question is, is the cost estimate right and does the water pump need to also be done? I see online different websites have the cost of the belt at approx $25, hard to imagine it costs $875 for labor.