Guineas are seasonal layers, laying spring through fall. So you may have trouble finding them this time of year. You might start in your state thread and chat with your poultry neighbors. Maybe someone nearby has some for you. Scroll through this link to find your state thread...https://www.backyardchickens.com/f/26/where-am-i-where-are-you
Welcome to BYC. Glad you decided to join our flock. I'm a chicken person and don't know much about Guineas (never had any), but definitely check out the links that TwoCrows has left you with. Please feel free to ask any questions you may have. We are here to help in any way we can. Good luck in getting your Guinea eggs.