I break and drop and lose sunglasses constantly, I have to buy 3 or 4 new pairs a year so I’m not interested in buying anything expensive. Until recently I bought some Chinese 5 euro crap but I would prefer to buy 10-15 euro EU made crap. Is there anything like that available?
Higher than your budget (~50€) but maybe others will find useful: maybe Meller? Not sure about the production and ownership structure but they say they were founded in Barcelona