HP as well, they are refillable, that is why I use them at work. Canon is a brand as well that also has refillable cartridges. The refilled cartridge coasts around 30% of the wholesale price, or around 20% of the retail price. There is a big mark up on cartridges all along the supply chain.
I just ask my refiller first if the cartridges on the printers I am considering are refillable, and this does winnow the list down to a dozen or so to choose from, and then often I look to see if the cartridge is one already in use. Just be aware that often HP and Canon cartridges are exactly the same unit, in a different box with a different part number, and a different price. Lot of Canon printers with me use HP cartridges. Same print quality, same operation and no "non genuine cartridge" message either on the new ones.