I was surprised to learn that DNA sexing (especially for silkies) is remarkably cheap. Only $12 according to this site: http://www.healthgene.com/avian-dna-testing/ (edit: USD)
Yes I've read about DNA testing but I don't think it's available in Australia , certainly not in tassie. I can see that it would be a useful tool for smallholders. Unfortunately if I were to use this technology I would have to pass that cost on to customers.