Just incase anyone is debating buying while looking at the 'names':
Obviously (well, maybe not), there is no red dragon acro available.
These are all maricultured acropora that do not have common names (none of these do). Like many retailers, they only list names to get you to buy them. They find the closest thing to it and name it that (even if its way off, and maricultured, they pick the closest one they can find).
You are probably referring to the pink acropora carduus (species name) mariculture coral. These are fairly common and pictures are online. Just look for the standard mariculture circular manmade rock that all maricultures come on.
Red Dragon refers to a specific strain of coral completely different than the mariculture impostor versions. It originated from CITR, but is sometimes called the 'Tyree', since he got his from CITR. It is not too rare nowadays. It is very easy to distinguish the impostor version from the real.
I am not saying the impostor version isnt nice also, just that it is clearly not the red dragon. It name is pink acropora carduus.
I am also not saying not to buy from them. Just to be aware of what you are actually buying.