Around my area, folks usually charge about 85-100 bucks for a class. The class is for a CCW permit. That said, there really isn't a high demand for other type of classes, mostly because no one has really offered it. That and it is a pretty rural state that is mostly agriculture. Big time hunt culture, not so much on pistol fighting.
As far as what I personally charge for the CCW class...free. I don't think it's right to charge folks for a class (that I don't think should be mandatory) so they can exercise a right. The down side to this is my time is being taken away from my family. I think here in the near future I may have to charge a small fee for just the time.
Now if I were to give a basic course such as a beginners class on pistols or rifles that did not relate to CCW, then I would charge. I figure for 8 hours then I'm going to charge around 100 bucks. This is for time and use (wear and tear) of my range. The price goes up if I provide ammo and equipment like eyes and ears.