Red Oaks
The West Virginia Department of Forestry is pulling acorns from superior Northern Red Oak trees. I'd give them a dingle and see if they are availiable for sale outside WV.
Be careful. Many members of the Black Oak Family hybridize amongst themselves making species identification in the woods a rather chancy proposition. Even if you get a pure tree there is no guarantee that it hasn't married outside the race.
In this Family are Northern Red Oak, Black Oak, Blackjack Oak, Scarlet Oak, Pin Oak, and several others.
In WV most of our good Northern Red is used in furniture and veneer. Much is exported to Japan, probably for the same purpose. The rest nowadays is used for paper manufacture. (pulpwood) The other species are practically usless for any type of construction except railroad ties
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In Australia you have a native wood (the name escapes me now) that is non electrically conductive, rot resistant, and straight. It is even imported to the US for use as fence posts. I'd check that one out if I were you. The future for a wood that can be used for decking, railings,play equipment etc. with no toxic treatment seems bright.
Check with your Department of Agriculture also. I live in the part of the US that was devastated (not to strong a word) by the blight of the American Chestnut about 1930. They may not be too enthusiastic about you importing an alien species of tree. May even be verboten