I got my pair from a show. They are both healthy, but looking back it was several probably barely 2-3 months, I was told they could be ok together in a big enough cage, and that the compact fluorescent would be enough. So it is not all great. But there is more choices and as mentioned, know the questions to ask.
I am in OR, there is a show coming in April that I tend to go to to sell my babies. I sell the full set up with proper lighting and care sheets. I will have how they were raised, under what conditions, and hatch date. These will be signs of a good breeder. ask questions you know the answers to an see what they have to say.
All in All it is a good place to shop. There will be good and bad so know ahead of time what you are looking for. In my case I did not have the knowledge, the booth I bought from "Looked" the best, the other Veilds I had found were just on a plain table in a small clear cup, so in comparison mine looked great. lol
Just find the seller that just wants to talk chams.