hi,
i'm from spain, and if you plan to buy film here, DON'T think about it.
It's expensive and apart from Madrid and Barcelona you will not find anything, even in those cities you will have problems to get some films (120 film and 4x5 is quite hard to get). Don't know when you will come here, but bear in mind that in august everything is closed for holidays here, at least shops that sell professional stuff in Barcelona. In other hand we have some very good labs, expensive but reliable people, again in august are all closed for holidays. If you need directions, on film shops, labs, anything send me a p.m.
I usually travel with my film in my hand luggage, and never never got any problems with fogged film and xray machines in the airports (and i shot quite a few 1600 asa stuff), just remember you that border police in spain can be really nice or a pita. But if you are nice, have a smile in your face and ask for personal inspection you can get lucky, last time i did that and one policeman ask me directly which iso were my films, i said up to 1600, then one reply me not to worry, Barcelona x-rays aiport machines are fine up to 3200, yes he knew what he was talking about.
have a nice time here!!