I bought a six foot and four foot straight edge from Lowe's. It's 2 1/2" wide. Perfect for getting the quilt top straight and for marking across the quilt for crosshatching or straight line quilting. Very inexpensive too.
http://www.lowes.com/pd_119896-1099-...ght+edge+ruler
Using a plastic suction bath/shower holder to put on the car window when traveling and sewing.