location matters- and the quilter-
some charge by the project- some by the square inch---and it varies greatly-
there is a list of long-arm quilters here on the board- check out the list= contact a few and ask how much (they charge)
look at different one's work- and choose people who quilt in ways you like-
some people will quilt a queen size quilt for $50 or even less- some a lot more-
lots of variables--the first quilt i had professionally quilted cost me $385---i was so unprepared...
it varies greatly state to state- town to town- and experience of the quilter....along with the type of quilting you want done...check out the list and see if there is anyone in your 'neck of the woods'
some do (long-distance)quilting too-