Comment by argiopetech

Faber-Castell had new-old stock in the mid 20-teens, but they ran out (of stock or patience) around 2016–2018. Picked up a 2/83N for under $100, and I wish I'd gotten more. I'd suggest some of those are on eBay now.

Most of my like-new rules came from antique malls, though I've also purchased one from Etsy. Estate sales are occasionally fruitful. As long as they were stored properly (e.g., in a desk drawer, like it seems they mostly were after the electronic calculator took over), they don't degrade. Occasionally you see minor yellowing that is cured by some time in the sun. Carrying cases (often leather) are typically more affected by time. I soak new (to me) leather cases in neatsfoot oil and give them at least a week before putting the rule back.

You could make your own with prints from the Slide Rule Museum [0]. 3D printing would make quick work of it, but I'm sure wood or metal units could be accomplished. The cursor benefits from spring loading,

They also have some pretty nice simulators [1], if that's your thing.

[0] https://sliderulemuseum.com/SR_Scales.shtml [1] https://www.sliderulemuseum.com/VirtualSR.shtml