About this Deal
HP has a subscription ink service for people with qualifying printers (you can check if yours qualifies at the link above - click the "check to see if your HP printer works" text right under the big blue Sign Up Now button). The lowest level plan is for 15 pages a month, and users on that plan get FREE ink from HP. How it works:
Your printer is connected to the internet, so HP can access things like ink levels and the number of pages printed. So as they see your ink levels get low, they will mail you new cartridges, absolutely free, as long as your page count each month is lower than 15.
This is an awesome option for people who have a printer that mostly collects dust, as it allows you to now print a page every week or so just to keep the heads in good condition, and HP will replace the ink for free once it runs out. I have one that only gets used to print the occasional boarding pass or concert ticket, so this plan is perfect for me. I'm sure many others will be able to make use of it as well.