are you guys talking about the Z-Plus Zippo butane inserts? If so, these things are awesome. We had a group buy on the ASC (alt.smokers.cigars) newsgroup years ago (when it was still very active) - a customized Zippo lighter (that says ASC) along with a Z-Plus insert.
I bought 6 more inserts from the guy because he had some left - they normally sold @ $17 when they first came out, but I got them for $12 because I bought so many, so I know deals can be made with dealers.
On the subject of Zippos - my dad bought a Zippo lighter when he was in the Korean War at the px for a few bucks. He used it so much it broke. He sent it to Zippo back in the 90's and they fixed it for him free of charge.