I appreciate all the help everyone, this is all good info to work off of. I guess I'll cut my (small) losses and sell for $10 each. Yesterday I offered them at $15 to a couple people who had asked, and they ghosted me, so I'll try reaching back out to them with $10 apiece and see how it goes. If they still don't sell, I'll raise them to adulthood and try again then at $20. I hadn't considered the feed situation, and to make things worse, this is my first year selling so I don't have much of a reputation yet, and I think people are leery of the possibility of paying good money for what could just be barnyard mixes being passed off as call ducks.