zippo literally sells ones they make on their website. I wouldn't see any reason to bother with anything else. I don't remember the price which tells me it's nothing insane either way as in not oh my god that better do more then make fire for that price, or must be a piece of shit if they can make a profit off that little bitty price tag.That was what I was also asking about. Where does one find a butane insert that fits the zippo case? I was reading there is one called Thunderbird so I looked on the amazon page. It sounded as though some had trouble getting that insert into the zippo case. I wondered if anyone knew what insert for sure would fit. Or if someone has used that Thunderbird and fit it into the standard zippo lighter case? I collecEd some zippo lighters years back and have a cool,one I would like to use with the type of insert u r talking about. Just not sure if it will fit. Thanks for your time.