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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.
Yeah, depending on where you live, it may be cheaper to go to your local printer shop. Plus minus cost of transport and your time.
I did not check HP's prices to Poland. Table lists 100 pages as 0.07EUR/page. Krakow, Poland, nearby printer shop takes ~0.02-0.07EUR per A4 page, and there is no subscription. Nor doing 100 pages.