Cheapest way to do what you want is to find your nearest mens shed and give them a call... for a slab or a donation to the value of I'm sure someone will help you out.

Me, I havent seen a piece of waste that size and 3m long leave this mill in years, and never in ironbark.... theres a perfectly good board in there and a few sappy corners in ironbark make no difference at all. That board will cup exactly as much as you let it, no more and no less. Stack it right and it'll dry flat every time. Just sayin'