In Barcelona, you have two choices for buying film - Casanova and ARPI. They're located approximately at opposite ends of La Rambla, ARPI at the harbor end and Casanova a couple blocks off the Plaza de Catalunya, across the street from the giant book/music/electronics superstore whose name escapes me at the moment. Casanova has I think better prices, and they were definitely more than in the US, but not radically more- maybe 10-15%. That was for 35mm color neg film - I didn't price black and white. I THINK Casanova has a branch in Madrid but don't count on it.