Depending on how fancy you need it, you can make your own. I bought some kydex on Amazon, a bag of rivets and a rivet tool, and built a press out of scrap wood and some of the foam floor mats from Harbor Freight.
The process is simple. 1)Heat the kydex in the toaster oven until it is plyable.
2)Fold it over your knife (masking the knife first keeps scratches off).
3)press the folded kydex between two pieces of foam and hold for about 2 minutes.
4) drill and rivet where you want it.
5) trim with scroll saw, hacksaw, bandsaw, etc. then sand it smooth
It's not hard to DIY. The biggest thing is cost and will you make enough to make it worth it. I did a write up a little while ago here- DIY Kydex Holster
If you can get a couple buddies who want some kydex stuff done you can offset the cost for foam/dies and any other tooling you need.