It has the same back print as others I've seen, but different tag - not Marina
It's a 'Clean Fun' tag.. never seen one before. I've attached a pic of the tag.

Hopefully it's legit - either way I'm just going to wear it so it's not a huge loss at $100
I only became aware of the shirt after seeing ...

Hey! I bought this CyberThug shirt online for $100, it’s normally priced for 5 or 600. Too good to be true?