I'm not sure. They have that sign behing saying "while stocks last". I think they may just be out of stock because I don't see why they would not sell it. They make all the paints in it separately, it is not like Space Hulk which has actual figures, though I think Space Hulk has appeared again.I know the old one went out of production when they released the foundation paints, but the "new" one is currently at "No Longer Available" status.
Does this mean they're no longer producing the set or is it just out of stock?
Hmmm, different countries perhaps? It makes sense that GW branches in different countries will have had different stock levels.
Let this be a warning everyone! If you want the Mega Paint Set, and find that you can still get one, get it now!