I have a Horsehide Beltman and its a good belt for sure. However I have also "gotten by" with a Walmart belt from time to time. It works fine for me when carrying my G27 IWB. Whereas the extra stiffness and quality of my Beltman is most noticed when carrying a heavy pistol with a standard Outside the Waistband holster.
Basically, I think IWB carry doesn't really need a $100 belt. You can find a relatively cheap leather belt to handle that job, give the pinch test to make sure it starts out stiff and is of quality leather -just know it will probably need replacing every year or two while that $100 rig can last a lifetime.
