They're not out of stock yet. Aquacave and aquarium specialty and I think premium aquatics have it for preorder. BRS will have it for sale when it's in stock. I don't know if Marine Depot will have it for sale as they haven't said anything about it. And they also have the new Apex up on the first page. I'm waiting for BRS to have it in stock so I can get points for my next order.
There is also one sponsor here that is taking preorders. Ultra Gem Reef?