Currently Out of Stock
Approximate delivery date from vendor: Sep 14, 2012
No mention of being discontinued.
I suspect they had a run on their stock after it had been reported Kodak is going out of business.
As Ralph say's, there are a number of formulas available to brew your own. In the past I've tried Paul Lewis's "Mytol" as found in Jacks Specs. I don't know how closely it compares to Xtol and it doesn't look much like Mark Overtons' (Albada/APUG) work with his version. But it did make negatives.
For what it's worth, the Legacy Pro ECO PRO Ascorbic Acid developer behaves exactly like Xtol. I've been switching back between it and regular Kodak Xtol, using it both replenished and as diluted stock, and I get identical results in my prints.
This is good to know in case you don't like to mix your own.
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh
Unfortunately I think it's discontinued.
I live in Italy. Today I've called the local pro shop to ask for some X-tol and they said that Kodak discontinued it.
If the same news popped out on the other part of the world I think we must face the music.