Not sure how comprehensive it is but I assume lumber yards are pretty long term. Hopefully this helps people like me who are having trouble finding a good hardwood source.
WoodfinderEDIT: for context, I had been looking for a good woodworker's lumber source for the last two weeks. Tried google, tried yellow pages, tried a couple other things... Woodfinder helped me find
this place 13 miles from home. That looks very, very promising.