I don't know if you're familiar with Simpson's Hardware over on Westmark, but they offer the classes. If you go back to the gun counter, they have a signup sheet. There's also a place over on Guignard in the little shopping center next to Murray's Donuts that offers the classes. I think both places charge $85 and it's an all-day Saturday affair. I've been considering taking the course with the guys at Simpsons. I know them fairly well from shopping in there and would feel pretty comfortable hanging out with them all day.
Hope that helps you out. If you need directions or whatever, just PM me and I'll get you where you need to go in Sumter if I can.
Best,
Matthew