hey scott, heres a couple of pics for ya.
First pic left to right or anticlockwise: greybox burl, blackbutt burl, brown mallee burl, redgum burl.
Second pic left to right: outback rosewood , emu apple , yarran , quinine , myall.
Third pic left to right: doolan , wilga , river oak , redbox , brigalow and down in front gidgee.
Fourth pic : dead finish,( aka red lancewood).
Scott, these timber are not commercially available timbers and there for are not kiln dried “premium grade” that you speak of, you cant just stroll down to the local store and buy this stuff Most of them come from very inhospitable desert country, where your thought quite mad to be out there the heat cutting the stuff. also 99% of the Australian burl ive ever worked has at least some small surface checks .
I can do my best to cut around the cracks that these timbers are renowned for and send you what i would consider premium for each species.
Cheers. ben