I guess that depends on how well they graze while free ranging and the price they paid per chick. Here is a estimated price breakdown.
Price per chick including shipping ~ $1.50 - $2.50 depending on how many they get at once
Add in a factor for chickens that have heart failure and the price per chick goes up by $0.50-$1.0
Food, the Meyer website says a broiler will consume 14 pounds, that is the low end imo but I'll use it. Now a bag of meat chicken feed is higher in protein and costs more about 38 cents per pound plus time and gas to buy it. so That is about $5.50 per chicken on the low side with the price of gas now a days.
Then there are supplies I'm only going to count the consumable type supplies so no waterers, coops, feeders, or run costs. Not even going to add in the butchering supplies since it sounds like you are buying a live chicken, but you would need a cone, a knife, table, trash bags, freezer bags, lots of ice too. But supplies they have to buy each time, electrolytes (2 packages for 100 chicks $10) bedding for the brooder box and the coop. The meat birds poo a lot so at least $20-$30 for 100 chicks, water if not on a well is about $10 - $20 here for what 100 chicks would drink.
I'm sure I'm missing something but here is the total so far: $7.9 - $9.6. That does not factor in a pay for the time or effort put into raising the chicken.
I try to rehome any extra roosters I'm not in the mood to process. I ask a $10 rehoming fee to recoup some feed costs and help make sure they don't end up as fighter chickens. The non meat broilers typically eat more than $10 worth of food by the time they are processing size. And I'm not ordering in batches of 100 or more so my cost for a chick from the hatchery is typically $3-$4 including shipping.
Overall I would say just over $10 for a meat chicken ready to process is a very fair price.
If you get them on the grass by about 10 days they will learn to graze better and they will grow slower. Also once they get old enough start limiting their food intake. if they have grass and bugs then there comes a point when you can feed them once in the morning and once at night, and eventually just at night. If I have read the info correctly free ranging the meat chickens can delay their butchering date but it does not have too. In the end for a delayed butchering date with free ranging, the amount of chicken feed consumed is very close to the amount of an 8 week caged broiler.