Some hobby breeders that come to my mind are Mike Heinrich (I believe he's still in IL) and Charles Koutris (soCal) as well as Kathy Love (of corn snake fame) has some nice ATBs. I'll finally start breeding once I move at the end of the year.
We used to have the Amazon Alliance website but Mike shut it down a few years ago sadly. I believe he started a closed group over on facebook that you can probably ask to join? I'm not on facebook.
For CBB you'll mostly have to go to hobby breeders.

Also, in case you were not aware, Halloween phase will turn out like normal garden phase as adults. The orange color fades to white/cream as they age, usually in the first year.

Good luck in your search!