Here’s a recent thread with good info:
https://forum.mattressunderground.com/t/only-firm-mattresses-for-kids
Here’s a good article, with links to other good articles at the bottom:
I recently bought a natural mattress from Flexus Comfort and was very happy with the quality of the product and the ease of the whole process. And I just checked and found their 7" natural Dunlop to be priced at $995 for a full size, FYI. That’d be natural latex with an organic zippered cover, and I can attest to zero odor with their products. I think one advantage over the Abscond would be the low cost layer exchange possibilities with Flexus. Their natural Dunlop is sourced from Latex Green.: http://latexgreen.com/LGbrouch_web.pdf