You've got to remember that these are frags, hence, "Collector's Frags". You probably can not get a colony that big. You buy a frag of 1-3 polyps and let them grow out in your tank, then turn around and sell frags for $300/polyp.
Those are some of the most gorgeous zoas I've ever seen. I doubt I'll ever own an Envy Orange but I would definitely be the envy of all my hobbyist friends if I did.