You can buy batting tape.
http://www.connectingthreads.com/too...r__D21128.html
It works great. No sewing required. However, it felt to me like it is just lightweight nonwoven fusible interfacing in a strip, so I've started just buying cheap interfacing and cutting my own strips. Very easy. Fairly cheap. I've done several quilts that have been washed many times. So far, all is well.