I buy it from a feed supply store in bulk.
It's .18/lb if I buy in bulk. They mix and grind it there, themselves.
I have to buy a minimum of 300lbs at once to get that price. I have two garbage cans that each each about 125lbs. F
illing both garbage cans and included tax it costs me about $65.00 every 6 weeks.
To supplement that, my DH has a distant relative that is one of the largest wheat farmers in Washington State. Every fall I get about 1,000lbs of "waste" wheat from him. It comes in 100+ lb bags. I feed that out in the runs and scatter it in their litter--they love it and it keeps them busy.
My chickens pay for their own feed by me selling them, hatching eggs and chicks during the breeding season. I save up my money in an earnest earning savings account and that gets us through the winter when they eat the most. They also bought 13 tons of hay for my horses this summer, too.
I do have A LOT of chickens, some ducks and a few geese....
I am finally starting to get some interest in eating eggs, too...which means I need another breed that lays very well and that I don't feel bad about selling for $3/dozen for eating eggs, LOL