I have a S&W 4563TSW that I've had for 6 or 7 years. When I bought it, I couldn't find one single holster that listed that specific model for fit, so I started going to all the gun forums I could find and asking around. Turned out that the fit is identical to a Sig P220R, which meant virtually every holster manufacturer makes a holster for my weapon, it's just neither they or I knew it! I've got 6 different holsters for it now and they all fit exactly right.
I just went and looked at a pic of your weapon and it appears to be very similar in frame and trigger guard to the P220 series. You might find it will fit, but if it doesn't, a bit of trial and error test fittings of holsters made for other similar weapons will surely get you a model you can order around in the future. You just have to find a store-front location that has a wide variety of holsters to try out.
If you aren't satisfied with anything you find with that suggestion, you can always have a kydex holster custom-made to your weapon. Even custom kydex is usually cheaper than off-the-shelf decent quality leather.