If you google pinless peepers, it'll list online companies that sell them. I checked ebay and bought a pack of 10 and it included a nice pair of backwards pliers to ease putting them on.
So my year old red hen thinks she is the rooster. (I don't have one) and has been bullying the girls. When I finally figured out which one it was, I put her in her own stall and told her she was dinner. Well, the next morning there was a beautiful egg waiting for me next to the door. So I decided to give her a second chance and ordered the pinless peepers to give them a try. She has laid an egg every day while I have waited for the peepers to arrive. They arrived yesterday and I glued some of my sons googly eyes on. See photo below!