Found! Globus on Bahnhoffstrasse recently had real brown sugar in the flour/sugar section. CHF6 for 500g. This was real brown sugar, not those cane sugars that lots of the stores around here carry. This brown sugar was really dark, almost black, with a very strong molasses flavor. Yum yum.
You can also make your own by simply adding about 1-2 TB of molasses to 1 cup granulated sugar. Mix with a fork until well blended. I learned this tip from Jack McNulty of laughinglemon.ch, who also recommended buying pure molasses (or "melasse" here) from health food stores because it doesn't contain extra additives that affect flavor among other things.
Now you can finally have that nice hot bowl of steel cut oats with brown sugar and cinnamon. Yea!