I am a longarmer and that is way too cheap...I charge by the square inch and I provide 100% cotton bat,thread and quilting. If you want the backing I have wide backing from from top fabric companies.
My rates start at 3 cents square inch for simple quilting and up depending on what you want. The backing is charge by the yd at quilt shop prices and you ,the customer gets the leftover fabric.
Binding is extra.
I pay for the shipping back to you.
The price that you were quoted seems way to cheap and what will the quilting look like..you pay for what you get . It sounds fishy to me.