Good thoughts, Tkscjpines, all people selling chickens tell you they don't have it. My silkie pullet that brought it came from a reputable breeder.
Whether you buy from someone or not, think about if your girls are worth the risk or not. Just get your vaccinated day old hatchery chicks. Or an incubator. You may have to sell roos as meat birds. I am being sincere and love my roos, but the reality is that I have 7 now because I didn't want to give them up. A forever home is less chance than 1%.