In the Migros Outlet you can get them for free if you ask

Yes, they used to be available from time to time when stores were newly opened or reopened, but unfortunately not for a while now, I could do with some again...

But that probably depends on which Migros outlet, doesn't it?

Hello faeb. There are occasionally trailers with chips for certain activities. I can ask your cooperative if they have any. Which region do you shop in? Best regards, Tamara