I think Dirk told earlier on this thread that TOHKBD2 is sold out. You might want periodically check in
http://funkyotherhalf.com/?page_id=9

You might want to contact funkyotherhalf and request one. If there are enough requests, who knows, maybe the guys will run another batch.

Otherwise you can try to buy one when they appear for sale, if that fails, you can build your own (schemas and drawings will likely be available).

There are naturally more drastic options for aqquiring one. Not recommended.