With U$1.800 dollars, a Brazilian person can take a flight to miami, buy a PS4 and flight back, and it would STILL spend less money than buying directly in Brazil. This is how ridiculous the price is.
I am about to graduate college in U.S (going back to brazil in december) and OF COURSE i will bring one extra PS4 with me and sell it there for a cheaper price, but i will still make a good profit on it.
When you cross the border you'll have to pay duty on it. Basically that's the tax you would have had to pay in Brazil.
Unless it's totally different if you have a school visa I donno.