I have no idea why some places aren't getting it and others are. It's also amazing how some stores/distributors/companies can say something that is obviously still in print (or just released) isn't available.
Many years ago when I worked for Kenzer & Company, we had a problem with the games buyer for Waldenbooks. The Kingdoms of Kalamar (KoK) Atlas had come out and yet a month later this buyer kept telling the stores that the book didn't exist yet. The president of K&C even called Waldenbooks corporate offices to work out whatever the problem was, but still it took like six months to get the book in stock so stores could order it.. by then the three employees (of a five-person staff) at my Waldens just gave up and went to a local game store.
...
Then there is the FLGS in my area who, according to them, kept getting told that two books which SJ Games was still selling through their online store was out of print... I ended up getting my money back (I had pre-paid for the order) and ordering it from SJ Games...