Compared with models available in specialist sale of astronomical equipment, opticians, pharmacy definitely see supermarket for a few euros (two euros on average). A good safe condition not to go at the last minute to avoid stockouts.
Yes, our health and that of our eyes is priceless, but no reason not to use this event to make a max margin and plucking people for a few minutes of observation! Especially since the eclipse glasses are "disposable" products (disposable hear!)
Examples noted: Nature Shop & D. 2 / Online: Jeulin: 1.62 (CE certified, equipped with suitable filters, CE compliant 89/686)