For my most popular overall patterns, I would charge $165 for that size quilt. That does not include batting, backing, thread or tax, so $200 is not out of line.
You can find cheaper prices, but there are a lot of factors that can influence price. Ask to see samples of the work. Are the stitches even and the tension balanced? Does the design complement your quilt top and fabric, or is it just the one design that the quilter is using that week? Do you have a choice of thread color or just basic white? Does the quilter baste the edges of the quilt as they go to be sure everything ends up square and straight, or are they just trying to git'er done?
As they say, you get what you pay for ;-)