Check around for Selle Italia Storica, Mitica and Epoca saddles, made briefly a few years ago. Lots of unsold old stock available. Prices are usually around $100 but occasionally dip lower. I put a few in my Amazon cart a year or so ago and the prices often dropped to around $50, but that was before the pandemic. Over the past year the prices have stayed around $100+. I'm in no hurry so I'm waiting for notification of a price drop again.

Check reviews the Selle Italia website for specs -- some of those saddles were full leather, others were leather stretched over plastic shells.