It seems out of the GW webpage.
GW announced this year they would discontinue the BOFA, but it was still available recently.
I think it may have been removed due to the forthcoming release of the Hobbit and associated games.
If that is true, it has no sense. They could sell more BOFA with the movie propaganda, and being a game on their own, and oriented to specialist games customers, I think it wouldn't stop the main stream of customers from buying 28mm figures (for the hobbit, LOTR, etc, etc...)

But, well, we all know GW policies, and it has been discussed other times in these threads...