Many long-arm quilters want to supply the batting from their store, because they buy it on rolls and get a better price than a retail customer can get. Also it is necessary to have your BACKING fabric extending beyond the front by about 8 inches. If your quilt top was 72 x 80, then your BACKING should measure 80 x 88 inches. (after pre-shrinking and cutting off all selvedges). This results in quite a bit of "waste" of your backing fabric, and you should ask up front for all your trimmings to be returned to you, whether or not you want the long-arm quilter to bind your quilt. Make sure you know all the charges, because you may be shocked if the quilter charges fees beyond the "per square inch" charge that they will quote you. Get everything in writing FIRST. For example, if you have a wide border around your quilt, the long-arm quilter may suggest doing a different design AROUND the center. This will add to the cost of having your quilt done for you.