Ask HN: Life hack for printing costs? Ink is eating my budget

Hey everyone, I'm curious if anyone has been able to find a sustainable strategy/hack to minimize ink costs over the long term.

We use our printer HP OfficeJet for letter sized black and white document printing, and small to half page image printing(still on office paper). Quality isn't very important, it just needs to be readable for documents and no high quality needs for the images.

We end up spending nearly $30 a month on ink, and I'm trying to find a way to get that cost down as much as possible.

What is your printer/ink combo that keeps costs to a minimum for similar printing needs? Are there notably more efficient printers?