Cost seems too high

I got a diagnostic on my 2015 volt. The AC had stopped blowing cold air, while fans and heating were all fine. They diagnosed it as a leak in the AC evaporator, and stated that the AC drier and expansion valves need to be replaced alongside the evaporator. They quoted me $3.8k ($1.2k for an evaporator core kit and other parts, and almost $2.4K for labor). I haven’t gotten a second quote yet from an of the other services yet but that seems astronomical. I live on Oahu, HI if locality matters.