When I was looking for YJ springs I was depressed at how much people wanted for them and how bad of condition they were in- considering the fact the last YJ was from 24 years ago. I ended up buying some crown automotive replacement springs online and I’m glad I did.
I’ve purchased used springs before only to take them apart and find that they were both cracking near the center pin. No bueno.
I have a set of 4, fairly new, RE 1445 springs. They are designed for spring over but are also advertised as a 1.5" YJ lift spring in spring under configuration. Not sure if that interests you?