Grower and all flock feed for older chickens will cost around $17.00 per 50 lbs bag and layer pellets between $15.00 and $30.00 per 50 lbs bag, depending again on brand and whether you buy organic/regular. Scratch grains cost around $10.00 per 50 lbs bag, between depending on availability and quality.he approximate costs to raise 3 hens would be: 1  Chickens: $3 - $30 per chicken depending on age, breed etc. 2  Coop: Free (recycled materials) to $2,000 & up (new & fancy). 3  Feed approximately $15.00 per month. 4  Miscellaneous $10.00 per month.