I am no expert on the topic, but I purchased a couple of 7-8 week old Frizzles at the Tilton, NH chicken swap last weekend. They were $12/ea at 7-8 weeks old (one cockerel, one pullet). People were selling other common breeds aged 6-8 weeks or so from $10-15/ea and most people seemed to sell out quickly. I don't know much about the breed you've got, but my assumption would be that high production egg laying breeds would likely be closer to $15/ea while males and lower production breeds would be closer to $10/ea.