> I think such device could cost about 60 euros

Making a thing made, shipped and delivered at 60 euros each on credit cards is HARD. 600 is easier. 60m consider it done. I wouldn't want to even make and sell, idk, a lens cap for a camera, at that price, without first owning couple factories running at healthy levels of utilization. Maaaaybe if my customers would be happy with a 3D printed artisanal version of it. But even then it'll technically be delivered at a slight loss.