That is very strange. It is distributed by Naxos and so should be readily available. Try ordering through Arkivmusic.com. They work directly with the distributors, who ship to you directly. So if they have it, then it should really exist. Also, I have noted sometimes with Amazon.com that they take pre-orders then cancel them when the title is actually released. I must be some glitch in their software--it happened with one of my books.
Dave H