Its only 3.99 a yard here in Phoenix, too, and it comes doubled like fabric does. Pre heat iron, set on hottest setting whatever it is. Fusible side up, then fabric on it, wrong side down of the fabric, then slowly iron. Make sure you have plenty of water in your iron's water holder. My Black and Decker iron is quite old yet it works well.
I even use the fusible batting for smaller quilts, so it doesn't shift when quilting it down. When purchase regular quilt batting, I also use the spray can of adhesive, and still lightly pin it on top, using the walking foot on my Sears Kenmore Machine an older 148 free arm model with its short shank. from, Debbie, Phoenix, AZ