Feed is $17 a bag for 18% chick starter, $18 for 24% at the local
Tractor Supply. More expensive at the local feed store. All 50 lb bags.
$10-11 for scratch but then you need to buy grit at another $10 a bag. Layer mix is around $15.
This is in middle Tennessee.
Starting next year I'll probably mix my own feed, but I expect the price to be similar.
It is much cheaper to buy a chicken at point of lay or beyond, even, if all you want is a production chicken. They average $10-15, less if they are a bit behind point of lay. More if they are a desired breed, which in this area seems to be Sussex (Coronation fetched $75-90 per mature bird at last sale), RIR, Orpingtons. Saw a mature buff Orpington roo sell at the local auction for around $18, and the hens around $20.
Of course, a lot depends on your location as far as prices and availability. I don't raise production chickens (ornamental only), but I do keep an eye on the local market for them.