Just try to find out other ways to get it, for example in resellers' webshops. I mentioned in a previous post a nice webshop: art of play. And I found this puzzle from them!
This seemingly easy (you're going to be fooled!) puzzle was designed by Andrey Ustjuzhanin crafted and released by Eric Fuller on June 2017.
The puzzle is only composed of 3 pieces, well the cage and 2 complicated pieces. The goal is to use the 2 moving pieces to repair the cube, a cube with a lot of holes by the way.
The puzzle is shipped assembled, maybe because it's safe during the shipping.
Normally you should have not too many difficulties to disassemble the puzzle because there are no really dead-ends. It's pretty straight forward. Just move pieces and if it stops, try to move the other one. And after several moves you should disassemble the puzzle. Note that I don't say "solve" because solving the puzzle is repairing the cube :-)
I can only advise you to take pictures of the puzzle while you're solving it. It will surely help you if you're blocked. Obviously repairing the cube is way more difficult as you have several possibilities to put the pieces. Oh did I mention there was a small rotation?.... :-)
It's not because a puzzle does not have a lot of pieces that it's easy to solve. Proof with this one!
I can only advise you to buy it from art of play while it's still available. And I can recommand to buy wunder bar puzzle from them as well. This is a very nice puzzle! You won't regret your purchase.