A gas powered hair straightener?! I have never heard of that... it sounds like it could be really dangerous in the right situation. But anyways, Target has cordless straighteners so you can check that out.
I can understand why you would want one, but why not just pull your hair back or something? Camping isn't about looking good, haha. Maybe I just have a strangely old-fashioned view of what camping should be, but I like roughin it. =P
But to answer your question, Sally Beauty Supply will have cordless straighteners. If you don't have one near you, check online.