Back in the late 80s until 1990, I charged $125 per spool of quilting thread I used. If I began using a 2nd spool, I charged the full spool price. Most queen sized quilts took 2-3 spools minimum. No one ever complained. Don't know what I'd charge now. I didn't furnish batting or backing, but I did offer to sew the backing pieces together for them at no extra charge.
In the classified section of most quilting magazines, there are ads for hand quilting. You could contact them and ask what they charge. I think they are mostly Amish and Mennonites.