There aren't any more announced to be available, (yet) Boboo made the needed resources available for free, so it's either make it your self, or find someone who wants to make a few. Well, thats my understanding. I also figured out i was wrong about memory earlier. There is a "to be created/released" memory extension that fits to the card, which would make it perfect for me. So i'm waiting, and hoping, that it wont be to expensive. For the right price i have friends who needs a WHDLoad machine. They might not know it yet, but they need em.
Oh, last batch of cards (only batch so far, really) sold for just shy of 70 Euro.