Hi skibeerr,
Photography and Arts in general are very much a developed industry in Buenos Aires, with lots of artists from the best. For photographers look at Flikr for one calling himself "Abre tus ojos", and tell me of 5 better ones worldwide.
But back to your original question, I think about film prices that cheap or expensive, are different concepts for the locals than for a tourist bringing Euros.
Cheers,
Ruben
Ps,
Well, I exaggerate a bit, but not that much 🙂