I make my own feeds.
I mix rice bran which is 14% protein but a little low on the amino acid called lysine with either soy meal (50%) or fish meal (60+%). We buy by the sacks. For adult chickens 1kg of fish meal and 50kg of rice bran, mixed with 80g vitamin and mineral pre-mix 60g salt and 500g oyster shells will give all the nutrition a chicken needs. The cost for 52kg finished product is 720p
I also offer free choice calcium through a feeder of oyster shells in the coop.
for chicks I feed 20kg rice bran and 5kg fish meal with half the additives. That is 23% protein and loads of lysine needed by chicks.
I save 30 or more percent over purchased feeds