I'm in east TN and had the same problem. Have you considered making your own. I mix and grid my own. It is easy to do, much easier to find the ingredients I want, and easy to balance different rations according to management groups. I use non-gmo corn, oats and field peas for my grains. Field peas are a great source of protein and the chickens love em. I add nutri-balancer to each batch and then add limestone and fish meal as needed (less limestone for chicks and more fish meal when i need higher protein). I balance each week according to the amount of BSFL I estimate I will have each week. I keep a batch of layer mixed up all the time and then a separate batch when I'm raising chicks and/or meat.
Being in SC it would be extremely easy to raise your own BSFL as they are native there. I am currently working on doubling my BSFL population to freeze and/or dehydrate enough to feed in the winter also. HUGE money savings.
Just some thoughts I'd share after years of experimenting to provide a good quality feed at a low cost. We've been pleased with the results.
Sheri
www.red-ridge-farm.com