Welcome to Backyard Chickens! We are glad you joined the flock! BYC is a helpful site providing all of the information you need to know about poultry. There is always space for members on the BYC roost! Please search for your state's thread to see if you can find any owners or breeders of the La Fleche breed. The link is below. https://www.backyardchickens.com/forums/where-am-i-where-are-you.26/
If you don't have luck in finding it, I would suggest a hatchery or Craigslist (Farm And Garden).