Not sure? Mine was $150 I think at 8". The trick is catching it without a panic run into the side of the tank. I figure you have one chance to catch that fish or you’re going to kill it.
Aros tend to panic easy but Blacks are the most calm. I do not mess around inside my tank. I don't move anything around and I never stick my hand it the tank. I'm very careful cleaning the acrylic of the tank with one of those magnet cleaners. If the Aro starts to look jumpy I just walk away for 30 minutes.
I have a trickle system so I don’t even do water changes anymore. Even water changes use to freak out my Black. So that’s something to think about if you get that Aro.