How much is that socket in the window?

This is the window of a shop that sells electrical items and door-knockers. I first saw it in "Italian for Beginners". It's a lovely film, even though the Venice section is only the last ten minutes. It is my hobby to find film locations (if they are in Venice). It started with "Don't Look Now", and has extended to "Brideshead Revisited", "Death in Venice", "The Wings of the Dove", and the aforementioned "Italian for Beginners".
The shop may be found on the Fondamenta de la Misericordia, Cannaregio.