Your best bet is probably something from Uncle Mike's, etc. that is nylon or cordura. I have a generic "large frame semi-auto" holster from a company called Ambi, which I originally purchased for a FEG GKK (also .45 ACP). It fits the 97B decently, but it is for range use only. It's not too hot, but it cost me $5. AFAIK, no one makes a holster of this type specifically for the 97B.
As far as the concealment/carry holsters go, I highly recommend those of Ken Null. I have two of his Speed Scabbards, one for the 97B and one for the 75B. I have never seen better design, craftsmanship, and finish in a custom holster. These are not cheap; a holster and mag pouch cost $150. They are horsehide, not cowhide.
Some people have bought several different holsters in between these two extremes, and the results have not been spectacular, by and large. I would get an inexpensive nylon holster for the time being, and consider the available options if and when you want a better holster later.