You need a duty holster right? Check with Blackhawk to see if they make one for revolvers. They do make good Level II and Level III holsters for semi-automatic pistols. I use their Level II for a Beretta 92FS. I used this holster in June when I was sent to the Federal law Enforcement Training Center (FLETC) for their Firearms Instructors program and it worked great.
Several others are Safariland, Bianchi, and Uncle Mikes. All of them should be able to ship to you.