Replace entire positive batter cable - $630 quote??

What is your question?

I was told at the Honda Dealership that my positive battery cable was corroded and was quoted at $630 to replace the entire thing. I'm not even having any issues with the battery or starting the car. Seems outrageous to me since the car is fairly new (2007 and covered under warranty). Another repair shop said he'd replace the end for much less. Any advice