Also, you can look at smaller European countries putting their national cover page on it, and selling it cheaper. It’s the same standard, in English.
The C standard is only a bit cheaper at the Lithuanian agency: https://eshop.lsd.lt/public#!/product/info/0a640332-9273-166...
Sometimes it‘s much cheaper: the Germans sell IEC 62443-4-2 for 400 Euros, the Estonians for 40 Euros:
https://www.dinmedia.de/de/norm/csa-iec-62443-4-2/331021994?...
https://www.evs.ee/et/evs-en-iec-62443-4-2-2019