The Epson EcoTank ET-4700 has an excellent supertank system. It uses four high-capacity ink tanks that you refill yourself and yields a lot of both black and color pages before you need to refill the tank again.
While it’s technically possible to fill the supertank with any third-party ink, we didn’t try it and don’t recommend doing so as low-quality ink could damage the print heads and, unlike regular cartridges, they can’t be removed if there’s a problem. Using third-party ink could also void your warranty.