Especially if shops like Tesco as much as double your prices without loyalty cards. Tesco is the worst, haven’t been there for months (as a customer).

Tesco Clubcard, Kaufland Card, Billa Bonus club, Lidl Plus (app required), Coop Jednota Club.

There is no alternative. Supermarket chains killed most small shops. Oh, and you may still need an app to manage it even if you have a plastic card.