Jack Ragsdale in Lumberton would be the closest - www.elitearmstraining.com
. He has some classes listed in May on his website.
Cliff Cargill is in Byram and would be another option - http://cliffcargill.com/
. Cliff schedules based upon his students and may or may not have openings next month. You'd have to contact him either through his website or on here.
Both get very good reviews as instructors. I recently got my NRA handgun instructor certification and live in Hattiesburg, but I am not currently set up to do classes and those guys do it all the time. If I can be of any assistance though, please don't hesitate to let me know and I'd be happy to assist. Just shoot me a PM.