Seth, just pick up a bicycle inner tube at wall mart and make them yourself.
By varying how thick or thin you make them, you can vary how much they stretch and the tension, and you can get dozens out of one tube. Thats all a Ranger band is <img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" />
The tape is also good for quikly wrappin up a few bundles of wood to carry back to your camp, saves much time and aggravation in lugging wood <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />