Do you cite the live pricing page, an archive, or both?

A source-trail question about pricing pages that can change after a comparison is published.

When a comparison depends on a pricing page, I usually want both the live URL and a dated note. The harder question is when to add an archive link immediately. If the price, plan limit, or country condition is the main point, the archive helps later readers inspect the exact wording. If the price is only background, it may be too much ceremony. Where do you draw that line?