I would say you have a better shot finding something made for a Sig 229 to fit the 940 into. I have a 945, and since both pistols are relatively close in design and dimensions, I know a lot of Sig 229 holsters work well. As long as your pistol has no rail on the lower, there's a Fobus kydex paddle, Don Hume IWB, or find a Biancchi Minimalist and you'll have an extremely versatile leather OWB holster.
You looking for leather, nylon, or Fobus style holster. I have a Fobus retention holster that was made for the Taurus 940 and it fits like a glove. Off hand I don't recall if it is for my railed or non-railed 940 however.