Playstation import cases (JP/PAL) where to find?

Not sure if this has been asked before, but I've had a number of import games that that use the strange "window" style boxes seemingly common to Japan and Europe- are they custom to JUST Playstation, or can they be found in bulk new?

I've found a few sellers selling original PS2 cases (MC holder style), but nothing for these custom PS cases.

Any advice? :shrug:

 

These cases are quite difficult to find. They used to be sold in europe.

I had one complete japanese Star Gladiator with the case broken and to replace it, i had to get one of those cheap japanese games nobody wants just because of the damn case.

 

years ago I searched for the source of those cases and found a factory does that as well as host of other strange(?) types. The only problem was the min order qty was too high for me to consider...
It was, I think, 5 years ago so can't recall much of details though...