I buy torch lighters made by Tiger, (Nibo), from eBay for about 6 dollars shipped if you buy 2 or more at a time.

They work great, they're cheap, and they're not particular about what fuel you put in them.

I have several Ronson Jet-Light lighters also. I use cheap fuel in them, and they always work. You just need to purge them before refilling, and give them about 5 minutes to rest before trying to light.