I price mine for what I am willing to let it go for. Sometimes they are free and sometimes one bird is $75. If people see what I do in the birds they pay that. I have been offered a lot of money for birds I would never sell, too. You just have to know what you want in the birds. Do you want to let them go? Are they good enough quality to let go? Do you even need them? A fair price is how you, the owner, perceive what you have. Sometimes people counter offer and you can live with the price so sell them for that.