They're not so common in MS. Over here I know of three different instructors just in my city alone, because Louisiana requires a class to obtain a CCW permit.
In MS, classes aren't required for concealed carry, and were just damn near impossible to find before they started issuing the "enhanced" concealed carry permit. And now, it just still isn't very common.
You may just end up having to travel a little. Try contacting a local range first though, they may be your best bet for info.