Oops! Missed your price question. I paid around $180 for a king size quilt. Most long arm quilters charge by the inch or give you one price per size. It's not cheap! But if you put all that work into a quilt and you can't quilt it yourself, it's worth the expense.
There are a few long arm quilters on this board who do amazing work. Check out the "pictures" page and see who does work you admire. Contact them to see if they do quilting for others.