I have never had a gutter replaced, but I would suggest that the best way to find out the usual price locally, would be to call several places and get estimates. I notice from your past posts that you are Canadian, so that could make a difference one way or the other, plus there could be a lot of local demand for new gutters after the windstorm.
Just out of idle curiousity, can you replace gutters when you aren't having the roof replaced? I thought that was usually done at the same time. When I move north, I am going to want those fancy gutters with gutter-guards so that is why I am curious. I have that type of gutters now and they are fantastic.
"You can never cross the ocean until you have the courage to lose sight of the shore." - - - C. Columbus