From experience, every time I have needed an ISO Standard (even rare stuff like "ISO 15489-1:2016 Information and documentation — Records management — Part 1: Concepts and principles") I could always go to my client, ask them to pay for the bloody thing, so I can show then what needs to be done to be 'compliant'. I could alwasys spend the $150 (and charge them) but I always wanted THEM to retain the 'thing' when I walk away, because if I buy it, then I keep it (and no pirated copy for them!)

Any company can afford to pay for the ISOs. It's not for hobby (99% of the time).