You can source it from most TDs.
Anyway, I
strongly advise you to buy a Gen, maybe slightly used Box on Chrono 24, Catawiki or eBay.
Rep boxes are all tremendously worse than Gen counterpart.
I bought several Rep boxes here on RWI (AP, Breguet, Blancpain) and they're made of plastic instead of true wood.
The difference with the real Gen boxes (which I own) is GIGANTIC and MASSIVE.
Please buy Gen boxes
![Thumbs up (y) (y)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)