Timing/Chain belt change

Timing belts should be replaced @ 60 to 80 k along with the water pump(beings you have to take the pump off to get to the belt) Different shops charge different prices, as a shop close to me quoted me $500.00 to do the Belt/water pump... and just up the street they wanted $250.00 to do the same thing. Dont take one shops quote... there are many rippoff out there!! GET A WARRENTY ALSO. (most give at least one year)