Introducing Der Funkmeister:
Works first time, every time!
I use these for my gas range at home (too cheap to use the pilot light) and for my campstoves. Salvaged flints from dead BIC lighters work perfectly and are longer than brand new flints for Zippos!
For butane stick lighters, I've found that the cheapest disposables work as well as if not better than the most expensive refillables. I once bought a Berzomatic $30 model that lasted about two months, while some of the cheap-*** ones I have are a year or more old, with lots of use.