You can buy from Lidl/Aldi and if you find that the goods are not to your satifaction (and this does not necessarily mean faulty) then you can bring them back for a full no quibble refund within 30 days as long as you have your receipt and the goods and packaging are all intact. You might want to clean the ear wax off the headphone buds first though.My experience is that they are usually poor and the sound quality isn't that great. That said if you don't know any better you'll not notice.
I....use good headphones if you want better.....