Online service, a link through CoolSavings. 2saveoninkjet.com is the website. I spent over $100 on ink refill system. They system is terrible, it’s a mess and has likely ruined my printer. They have a 100% money back guarantee, but when I called to return the product they said it was too late, it can only be returned within 45 days. I waited on line for customer service for 10 minutes, then was instructed to leave a message. I called back for sales and they answered right away. Terrible company to do business with, I am out over $100.