Great idea! Offer to help quilt what they buy. We call our childrens "draggin" quilts instead of charity quilts, because we HOPE the quilts will be loved and dragged all over the place!
Our Quilts of Valor are about a $100 project, and I wouldn't think of telling anyone where they were going to spend that much on the charity. Does the LQS owner belong to your guild? It's your right to shop wherever you want.