Well, my flocks not "certified organic", but they're organic! For our state, it would cost me $700 to just get the cert alone.
Far outside my budget to bother, that's for sure!
I do advertise chemical-free pasture free-ranged eggs supplemented with certified organic layer pellets (feeder is topped off as needed), Black Oil Sunflower Seeds, fresh fruits & veggies, flax seed, and oyster shell calcium.
Yes, certified organic feed is more expensive - sometimes as much as 3x as much as the plain ol' layer pellets. But I have absolutely no problem selling my eggs for $4/doz for large eggs in these parts and that pays for my feed for my flock of 40 easily enough with a smidgen pocket change left over.
(but I don't heat our coop and don't use artificial light either, so I don't have that as an expense either)
As others have suggested, check to see what the going rate is in your parts. You can check your local grocery stores, CraigsList, newspapers, etc.