Proprietary Frogs

Are there Dart Frog breeders that are known for selling only their own frogs and not selling frogs that were bought from a wholesaler?

The reason that I ask is that I held back three frogs from my large group of froglets that I sold to someone. I'd like to raise up a divergent group of frogs and I want to make sure that I don't buy my own froglets.

Thanks,