Okay I found them at a store called Rural King they had tons of breeds to chose from we also have a Tractor Supply around here and they always just had a few breeds. Rural King had 15 breeds to chose from and also had Turkeys, Ducks, Gunnies, and Pheathents. Don't know if I spelled that right lol. I have 3 ISA Browns and 2 of them lay dark eggs and they are pretty big. They lay like everyday. My other ISA lays giant eggs that have these like white spots on them but it's really because in the light it looks purple! This egg sounds like it sound be coming from a Easter Egger right?! Well I hope I could help you. Just wondering how did you know that I had ISA Browns? One more thing if you want to you can just PM me about the breed.
Can you tell me about your Isa Browns? Where did you find them and most importantly...do they lay a dark brown egg like you find in the grocery store? Those are hard to find.