https://www.aliexpress.us/item/3256805023659024.html
Lexon has a carbon 3D printed saddle on sale. This is the cheapest carbon version I've seen. Most AliEx searches deceptively shows the non-carbon saddle price while the carbon version is priced much higher.
I have these on my bike for bit over a month now, unfortunately couldn't ride so much as I used to but got about 35h on them
gotta say the material and finishing quality surprised me a bit, got some micro resin failures in the back which have no impact other than visual, and some glue excess which also have no bad effect. The carbon bonding is what got me, the rail is really well bonded to the saddle, not just like 'glued' as it's with most cheap carbon saddles (which I had 3 or 4)
just don't expect too much of the 3D web, it seems to be the same through all the area of the saddle, not like the Specialized, Fizik and others which have different layering and density depending on the area for different support - but, of course, what you'd expect for that price?
it's still a very decent saddle and it's comfortable, I think was an ok cost to try it and am happy with it (by now, at least)