Funnily enough, they are only available online:

https://www.migros.ch/de/product/mo/4971932

Hi tirggel, thank you for your message. We regret that you are missing your treasured product in our stores. In fact, the item is now only available in selected or larger supermarkets. The soap steel mats are currently not listed on the website. Please let us know your preferred shopping region - we will be happy to check availability for you 😊. We look forward to your feedback! Best regards, Lea

Seen today in the (large) Bern Marktgasse branch and photographed by mistake... 😉