I'm not sure about breeders, but for reptile supplies Plano Pets is supposed to be very good. I haven't been there myself as it's a bit out of the way for me, but I've heard they have a good selection of products and tanks and things, just that the animals don't look terribly healthy. In Fort Worth, there's the Big Cheese Rodent Factory. Next time we order rats and mice, we'll get them from them, as I've heard good things but once again haven't been there yet. Also, if you pick up your order from their factory they'll sell live rats and mice too.
Welcome to the area!