Just got back from Baja, got dinged cost $95 dollars for a housing for an OMD EM1 MkII. I made the mistake of not arguing it enough and not lowballing them enough, I was too worried about them looking up the actual price of the housing so I said $600. Tried to play dumb with Spanish and use "small camera", "GoPro", and had everything in my backpack, but they are getting very very specific and targeted with questions and honestly have enough staff that are excellent in English it didn't really work.
Of note to anyone else traveling in this area, you also get fined for a second laptop ($100 for me). If you have two pass one off if you're traveling in a group or separate them into multiple bags at least, that's what got me the most. On the bright side, I never have to pay it again for this underwater system, will just get hit again if I come back after the upgrade.