I'm not a big fan of the IWB carry style but if you want to see a few well made brands check these sources;
www.Miltsparks.com www.blade-tech.com www.galcogunleather.com www.safariland.com www.highnoonholsters.com www.comholsters.com www.tedblockerholsters.com www.mitchrosen.com .
Alessi, Greg Kramer, DeSantis, Tex Shoemaker, Don Hume & Aker also sell IWB rigs.
The "Summer Special" designed by the late Bruce Nelson(a CA state narcotics agent) and the LFI holster by Ted Blocker(with advice from noted tactics/author Massad Ayoob) are popular.
The Galco "Tuk" models and Crossbreed have many supporters too.
Clyde