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HP raising Instant Ink subscription pricing significantly
(www.ghacks.net)
This is a most excellent place for technology news and articles.
If they want a third option, I usually recommend Brother, and even more I tend to recommend used/refurbished. We just don't carry those in my store.
Brother used to be the best choice, until ~2020 when they, too, went over to the dark side and secretly blocked third party toners via firmware auto-updates.
Not sure if any non-shitty printer makers are left, there's only so long that you can recommend "try to find an old Brother printer and disable firmware updates" is an effective choice.