TOo high in my opinion. I just replaced strings and cables on a 2-cam bow for $125.00. Shop installed Vapor trail strings. Great strings made here in MN.
A couple years ago I sent my bow to a guy on Archery Talk and he made custom strings, installed them and tuned the bow with one of my arrows for ~$200.
Strings are generally $60-80 plus install. Total should never be more than $150.00