Which printer you get depends on the plan you choose. They start at $6.99 per month for 20 pages’ worth of prints and whatever the current HP Envy model is, and go all the way up to a $35.99-a-month affair that gets you an OfficeJet Pro and 700 pages. If you go over your page allotment, HP will add more for a dollar per block of 10–15 pages.
This is 100% a trap for elderly people who reflexively print everything they see on the computer.