It's still not available in the U.S. One UK link is here.
The aforementioned link is from a British company called "Active Robots". A couple of years ago, I ordered an NXT supplemental set from them. (The set was sold out in the US). A person from Active Robots emailed me immediately, to inform me that the set was available for a lower price elsewhere. Any company willing to cancel a sale so that the customer can save money elsewhere is a good company.