I don't know why quilters don't like sheets. We use sheets to back our quilts that we give to people in need in our community. We have a Fred Meyers in town and frequently they put twin sheets on sale for 3.99. They are good count sheets. This week they have an extra coupon we can use for 20% off which brings the sales price of the twin sheets down to 3.19 per sheet. IMHO, that is a bargain since there are more than 2 yards of fabric in each twin.
Hope you enjoy your new longarm set-up. Happy Quilting!