I think what Don was referring to was that quartersawn wood expands and contracts half as much as flat / plainsawn, which is important in guitars.
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Yes. I build acoustic guitars as a hobby. I get most of my quartersawn wood from exotic and domestic hardwood lumber...
If you don't want to saw your own (perfectly valid) - there are several very good luthier supply places that sell it in the dimensions you need....
Don't overlook Aaron Hix and Bob Cefalu. Allied lutherie often has some good stuff.
There are also individual
Luthiers who will sell out of their stashes such as John Hall...
Huge props to Old World Tonewood.
The guy is a violin maker who started the company to get his own stash.
He has the nicest Euro Spruce that I've had the pleasure of working with.
His maple and other stuff is likely great too.
Colonial tone woods is great.
Luthier's mercantile can be hit or miss. I've had great wood, and some very bad wood too.