Bart de Groot
The Air Pack is out of print. So is Campaign Book Volume I, and the Battlemaps (packs of pre-printed with terrain maps with scenarios and a couple of extra pieces/cards in each). I believe that covers the out-of-print stuff. Everything else is still in print.
I've also seen some ppl are worried Operation Overlord (the box with the Overlord command deck and cardboard chits) is running out.