Youtube coughed this up the other day, a perky young American couple who decide to do some price comparisons at the Migros in Interlaken. They seem to be from Utah currently living in Germany, with some kind of PX access, or something. Have not researched their other posts.
Executive summary - more expensive than Germany, sometimes "double." But that means something that they think should costs 2, costs 4. Get back to me when you're talking real money, like 25 is 50.