Weird, I've never seen it there, and I was just there in June. I'll have to call around for next time I'm down there.
edit: Astor has it, grumble! I must have missed it when I was there, but I got stuck recommending scotch to someone and then I had to catch my train... I'm grabbing that next time I'm down, thanks for the heads up!
I've been surprised at how quietly it's been introduced. I'm pretty plugged in and I only noticed when it started appearing on menus at bars. It's great stuff, and $30 a liter. Next time you're at Astor look for it on the amari/aperitif shelf by the Zwack.