Good quality 9mm revolvers are hard to come by. I have the Ruger SP101 in 9mm and 327 Federal Magnum. If you can find one expect to pay some big bucks for it.
I seen a nice Smith 940 in 9mm and should of jumped on it right then & there, Next day it was GONE.
You can find the Ruger Blackhawk converable with the two cylinders 357/38spl & 9mm.
They also make the Blackhawk converable with two cylinders 45Colt and 45acp.
If youbuy a 9mm revolver make sure you don't go cowboy with the moon clips, I've seen people bend them either incerting the bullets in to them and taking the empties out of them.