Another HP user. The Instant Ink thing can save money....
Thought a description of the "Instant Ink" HP Ink Subscription plan might help.
1. The printer must be set to communicate with HP via the internet, and keeps track of the number of prints produced.
2. You select a plan that approximates your monthly number of prints. All printed pages count the same. A page with one word or a full page high resolution color photo, using gobs of ink, count equally as one page.
3. Plans start at 99 cents per month. I pay $2.99 a month for 50 pages. Unused pages can rollover to be saved for later. Pages beyond your allotment are charged at a fixed price per page, but if your experiencing a surge of use, you can temporarily upgrade the subscription as-needed.
4. Ink will be mailed to you automatically, as the printer starts to run low. Once, when I had not printed for a long time and the cartridges dried out, I contacted HP and they immediately mailed me a new set of inks for free.
The HP Instant Ink dashboard I see on my computer:
They always stay ahead of my ink replacement needs. This is the amount of ink they've sent that's waiting to be installed:
Edit: Funny, but I just saw that there are expiration dates on the cartridges, and some are expired. Didn't realize they are perishable.