I was looking for some posts about Zippos and I thought you might want to check out this site I sometimes use:
https://community.auctionsniper.com/eve/forums/a/tpc/f/295608021/m/161609121
All of their lighters have Zippo inserts, and are based around Zippos. They're located right in Bradford, PA (the birthplace of Zippo) and their prices are good.
Let me know how it goes, happy hunting!