It's depend on the fish. Mine is not aggressive at all, I think it can be related to the gender, I probably have a female.

You can get one at King Ed Pet Centre. They sell them at approximately $150 ish.

If you become a frequent customer. Ron the owner can order you anything, he does his saltwater order at least once a week.

You don't need to be a frequent customer for him to order, lol. He's a good bro!

I'd have to agree. In general though; they've been known to be a little on the aggressive side. I've had mine for years and haven't had an issue aside from an odd skirmish with a wrasse or two - and it was temporary at that.

I think the hierarchy of aggressive tangs would be (again, my opinion):

Sohal
Achilles
Clown
Purple
Powder Blue

If you're patient and want a nicely coloured one - try and aim for one from the Red Sea ;)