
Welcome from Berks County! Technically speaking there is no such thing as Non-gmo chickens (because they're domesticated animals, and by definition selectively breeding for traits you like is considered genetic modification).
However, I know exactly what you mean, and what you're trying to avoid so I'll try to help the best I can. If you need strictly Organic raised chicks, that's going to be a bit more difficult, and I personally don't know anybody off the top of my head that could help.
However if you would just like chicks from a local farmer that has all of his birds outside in good conditions with no funny business. I do believe
@dheltzel should be firing up the brooders soon if he hasn't already. He normally has a very large selection of chicks, ducks, and other poultry available.