I let the market set the price, so the $10-$100 is about right.
I know people that live on the outskirts of big cities with progressive backyard chicken laws that sell everything they have available at 2-3 times the prices that what I can get for similar quality birds. I live 2 hours from any town with more than 15,000 people in it so the demand way lower.
The way I know what the market value is at is I post what I have available and wait for a few weeks. If I get more people who want to get birds than I have available my price is too low. If I get fewer inquires than I have birds to sell my price is too high.
If I post pullets and cockerels for $10 each an no one wants them then my price is too high regardless of what other people in other area are getting for similar quality. If I post them for $100 and I get more inquires that I have available stock, then my price is too low.
How long have you been breeding Legbars? The more established the line the better price people will pay.
What type quality are you selling? Breeder culls, Show winners, Breeding stock, other? Breeding stock should get a better price that Breeder culls (but not always will if you can't find buyers)
How old is the stock, day old? less than 8 weeks? less than 16 weeks, less than a year, less than 3 years, more than three years (The age of the stock make a difference in price too depending on what age your buyers want to get).