Husband should buy the Stewi Libelle declared as a promotion for his wife at the DIY store. However, the promotion only applies if the Cumulus card can be presented.
Not that our family doesn't have a card. But it's in the wife's handbag. There is no discount if the card cannot be shown. Husband wastes 1 hour pointlessly trying to shop.

Dear Migros. Are you actually .......ert?
Do you know where you can shove your Cumulus system?
You make several thousand francs in sales with me every year.
You're the only place where people can buy goods.

Of course your Migipedia rules apply. These are just to ensure that your system is not criticized too loudly in the forum.
Don't worry. This is the first, only and last post from my side. I can also source my products elsewhere!