They buy it locally, so I would expect different stores to have different
Around here I can find good stuff at HD if I pick through the piles a bit.
About 20 years ago a Grossman's store found it wasn't selling any lumber at
all. Turns out the decent stuff had been picked out and they had racks full
of crap; so their inventory system didn't order any and no one would buy
what was there.
Sounds like a myth, but it actually happened.