Join the facebook groups where people sell their bottles and all. Git is often seen for 110-140 $ for a 4 oz bottle.
Else you can check fragrancenet. Plus if you can host a split or get in on one, there are 17 oz git (500 ml i guess) for under 450 or 500 dollars at fragrancenet which results in at max 100 usd per 100 ml. (Just checked again, it seems they're out of stock)
Or you can just buy cool water and spend the remaining on other niche.