My absolutely favorite source of new fish are the many aquarium clubs i belong to, unfortunately all of mine take the summer off because of poor attendence, but Sept. is just around the corner.
It's a good place to bring the fish you breed & put up for the auction at the end of the meetings.
I'll include a site for a breeder from a cichlid club i belong to, don't be fooled by whats listed, she has LOTS of stuff thats not. ( including altum angels)...Rich
http://frybabies.com