One of the best sources of feed in TN is just up the road from OP. I don't use him cause it's a three hour drive and then I don't have the equipment to unload it. I ended up going further south only because the salesmen live just up the road from me.
For planning purposes, once you get them laying again. Optimum performance, most eggs with minimum feed, on a grass or free range system is 4.5 oz of feed per bird per day. So 40 birds = 11.25 pounds per day.
Ok... In your situation, contact Johnny taylor farm and get your layer from him. He's within an hour drive from you--but he prefers to sell in 35 gallon containers.