I think the point I'm making is that One person's poison is another person's gold.
If you look for the larger trees and breaking them up, or hollowed logs, then you find much more than those, cough cough, "beaver sticks".
But........at least some folks have bothered to sell it and charge what they think is fair for their time and trouble(crap, I do not wanna do that personally, even if it was top dollar). I do not mind for some projects etc, but I'm not one to do it "on going".
I think the supply in CA is such that most anyone living in the Central Valley or foothills, mountains could easily do this and find more than enough, burls, roots, nice larger trees etc. Those cost more to ship, but the wood itself in not that heavy compared to most wood.
Also, nabbing tropical rainforest wood vs a fire hazard locally seems more appropriate. Mopani is use for fuel and many other uses in Africa, not sure about the Malayiasian wood. Amazon old black wood, not sure either. There's many types etc, but this one I know is a weed/fire hazard here, and it's local.
Like produce, Glass tanks, stands etc buy, DIY and obtain local when you can.