I have a LEXMARK printer .. it's not the best printer but it's what we have at the moment. Anyhow, we do through a lot of cartridges, black and color and to purchase the combo set, we have been getting them at Walmart for about $37.00. They have the best price in this area. I kept seeing this place, Cartridge World North and decided to check them out. They filled 2 each for me .. and I had several more empty ones that they really wanted because they don't get many Lexmark ones and they bought all of them from me. So, I got one FREE set and the second set filled for $27.00. I saved $10.00. He also told me he checks them all out before the customer purchases them back. He told me if I had a problem with them when I installed them and began using them, to let him know and he'll exchange them, no charge. In other words, he guarantees his to work. They can be refilled up to five or six times, sometimes, only once, and some, not at all. Just depends. Since we go through a lot of these, I plan to continue to use the refilled ones.