We found an easy solution - Waves Protect phone case with anti-fraud pocket. As it blocks the EMFs, your credit/debit cards are completely protected. The pocket is tight enough to hold a card, so you don't need to worry that it falls out.
What makes it even more useful is that it is so comfy, that you can just throw away your wallet. You don't need it anymore. Going to the shop? The only thing you need to carry with you is the Waves Protect phone case. Quite convenient, right?