I agree, they can be unreasonable. I drove from Mendoza to Chile with 2 surfboards which I did not declare when I exited Argentina and they looked up the price of my surfboards and charged me tax for them.Did you know that Argie custom officers have the power to disprove foreign invoices??? Just a little advice.. don't cheat on the real price too much, they can still charge you for their own estimate price if the price doesn't look real... Even if it's a black friday sale