LightScribe was always a disappointing and costly technology, and the phasing out of this media has been expected for several years now. I'm honestly surprised production was maintained as long as it did. While I'm not 100% sure that it has been discontinued, it is very likely.
You'd need to ask Verbatim USA for more details:
http://www.verbatim.com/contact-us
Not that you'll necessarily get a good answer. But it's worth the attempt.
Also worth reading:
http://www.digitalfaq.com/forum/medi...a-burners.html
LightScribe has been described as the Daguerreotype of blank discs. It's sort of a muddy sepia toned image on top of a disc, and it fades over time. It's pretty well inferior to inkjet media, in terms of label quality. But it has the added benefit of not actually having a label surface (which can peel or bubble over time). It's a trade-off.