They are about the same, +/- few hundred yen. You can go to yodobashi.com, enter your favourite film's name in search bar and it will come back with the result.
400h is 3280yen.
I've stocked up on provia 400x and Neopan 400 while I was there few weeks ago. Also if you do your black and white, you might look into getting fuji developers like Microfine for Fuji Acros and Fuji Super Prodol for Neopan 400 (that is if you shoot 35mm).
Enjoy your trip.