Hiya, Bianca, and welcome to BYC! 
My best luck buying/selling has been in my local and state poultry groups on Facebook. You'll find several of them have chat groups so you can look down the list and join the groups that pertain to chicks or chickens, then there you can post pictures and freely state prices, etc. I post in the groups too, and just tell folks to message me if interested, as on FB, we can't sell animals, yet we all do.
Such pretty chicks!

My best luck buying/selling has been in my local and state poultry groups on Facebook. You'll find several of them have chat groups so you can look down the list and join the groups that pertain to chicks or chickens, then there you can post pictures and freely state prices, etc. I post in the groups too, and just tell folks to message me if interested, as on FB, we can't sell animals, yet we all do.

Such pretty chicks!