I had the same problem 2 weeks ago..
The GS920 BOSCAM was the 3rd option for me.
I ended up with the FatShark Attitude SD cause the Skyzone was not available anymore.
When I asked the dealer I got this message: 'Due to factory supply problem, this video glasses no date for when next batch can be available'
To bad.. I really like the Skyzone. (more info:
http://www.youtube.com/watch?v=4jjPHLsCZIw )
Did you have a look at the GS920 BOSCAM?
I believe that they are made in the same factory as the Skyzone!
The nice thing about the Boscam is that the receiver does both 4.2GHz and 5.8GHz.
My 1st choice would have been the Skyzone.
My 2nd choice would have been the BOSCAM
I bought the FatShark Attitude SD..
I've got no clue why I did this :-/