I go through a $20 / 50lb bag a month with 3-4 birds. The biggest expense is the coop and run which cost about $1000 when I got finished. Very much over built, but also very secure - lots of predators to keep out. Bedding for the coop, I went the most expensive way- hemp. But, I only have to clean the coop out maybe once a year, so it’s worth it. (Approx $50). First year you’ll get about 20 eggs a week from March-October. Slow decline after the first year. You can put a bulb in the coop during winter if you want them to keep laying, but you also deal with freezing eggs, and fire risks. I just think it’s good to give them some time off. Like humans, chickens are born with all of their eggs. If you deplete them quickly, then you have a chicken who doesn’t lay anything, sooner.