How much should I pay to have the water pump replaced?

[BennyLava]

Hi all. My 2009 Yaris is making some kind of engine noise. Almost like a soft, clattering clacking noise. Still loud enough to be embarrassing. The noise increases as the engine revs. I took it to the dealership to get their diagnostic, they said they believe it's the water pump. And they said that the pump is leaking. I did not notice a puddle, nor has the low coolant light come on.

Still they're probably right and the pump is making the sound.

How much should I pay a reasonable mechanic to replace the water pump? I'm assuming $900 is exponentially higher than the job is actually worth, in typical dealership fashion.

Would say... $300 be closer to the mark?