YOu can usually get GIT on Amazon for $130 or so. Just make sure you are buying from Amazon.com and not somebody selling on Amazon.
Word bruh, I've read so many complaints from users about counterfeiting on Amazon. Some Amazon Users purchased colognes and gave it bad reviews, not knowing what they had is a counterfeit item. So what they're actually smelling is something completely different than the genuine item.
I usually shop for cologne at Sephora. However, I wouldnt mind shopping at Meiman Marcus, Bloomingdales, or Macy's. These places should be safe.