Its also worth noting that you can basically find all of the standards in their draft forms for free. You need to be slightly careful about the revision numbers, but often the drafts are identical to the ISO ones. You really only need to pay for the draft if you want to be certified as in compliance or are an enterprise user. In which case the fee is paltry.
Is there a way to search for these? I've tried trawling through many sites to find draft versions of ISO 32000-2:2017 but it seems to have fallen down a memory hole. Is there a naming convention around drafts or is it just luck of the draw?