Lots of industries have waste products. I imagine most are unsuitable as growing media for one reason or another. Even coco fiber requires some work-arounds. Peat is only used because there’s just so much of it.
Try crushed walnut shell or corn cob media…available by the pallet for I guess sandblasting?
You can buy peanut hulls (doesn’t seem that much different than coco tbh) in various grades.
One of my favorite mediums is tree fern fiber (for epiphytes, terrariums etc) is difficult to find and too expensive to grow in.
One guy messaged on me saying he was using construction rockwool (stupid cheap) vs hydro store rockwool and said it worked fine (at least for cloning). I need to try it out someday because rockwool croutons are my favorite but so expensive.