Let me know how they are, I hate artificial strawberry flavour but if they are as flavourful as their cinnamon counterparts, they should be interesting.
I though that I had seen them at one of the bigger Carrefour markets in France, but I looked a a midsize store after reading your post this morning and had no luck.
That's Backpulver, isn't it? If you mean Bicarbonate of Soda, that's "Natron" in Migros/Coop but don't bother buying that, get yourself to Germany and buy Kaiser Natron in a big box.
Backpulver is baking powder. Baking soda is a component of Natron but not exactly the same thing. I remember we used to put a box of baking soda in the fridge when I was young to keep the fridge fresh but I am not really sure what my wife needs it for. I just know she recently got an American recipe book.
Backpulver aka baking powder is sodium hydrogen bicarbonate (aka Natronhydrogenbicarbonat aka Natron aka bicarb aka lots of names) plus something added, I forget what. Baking soda is just bicarb, they don't sell it in boxes in Switzerland but the stuff called Kaiser-Natron you can get in Germany is definitely what is known as baking soda. I use it as such and my cakes / cupcakes and things turn out pretty well. Cheapest place to get bicarb has been Italy, but maybe I just missed it elsewhere. There they sell it in big white cartons marked with "Solvay bicarbonato di sodio" in blue, praising its "thousands of uses" for about EUR 1.50? Might be a bit more or even less, no idea, it was so cheap that I didn't pay attention.
By the way, I spotted the introduction of a limited edition Marshmallow Flavoured Energy Milk (that stuff Emmi makes, formerly advertised by DJ Bobo). Now if you could stick that stuff over Lucky Charms cereals, surely some part of your brain's artificial flavour recognition centre will explode, no?
You can get a British-brand baking powder and baking soda in the Jelmoli grocery store in little containers that are about 1/4 cup each. But I usually just get mine at Coop or Migros, where baking powder is called "Backpulver" and baking soda is called "Natron..." something or other. They come in little packets. I've never had a problem using those in American recipes that call for baking powder or soda.