We need more!
Amazon has begun shipping the Canon EOS-1D X I'm being told by a lot of people. Another big shipment to Amazon is expected in the near future. As far as I know, they haven't yet reached the end of their preorder list.
The best retailer to keep an eye on if you haven't preordered yet, is probably Norman Camera. They have twice had the camera available and in stock. A new shipment is expected soon. Camera Canada may also be at or near the end of their preorder list.