Jeni's XSLT 2.0 Book

I've just got this email from Amazon:

================
Dear Customer,

We are sorry to report that, despite our best efforts, we have been
unable to source the following item:

  J Tennison "Beginning XSLT 2.0: From Novice to Pro"

We apologise for the length of time it has taken us to reach this
conclusion.  Until recently, we had still hoped to obtain this item for
you.

This item has now been cancelled from your order and we can confirm that
you have not been charged for it.

Please accept our apologies for any disappointment or inconvenience
caused.
===============

Anyone know why this is?

cheers
andrew