The G7020 has an outstanding cost-per-print ratio. It’s very affordable to print in black, color, or photo, especially when compared to the cost of the cartridges, as each cartridge can yield a lot of pages before needing to be replaced. While you can buy each cartridge on their own, Canon also sells a bundle pack that could save more money down the line.
Keep in mind that even if you print only in black, most inkjet printers continue using the color cartridge for servicing tasks, so you’ll likely still need to replace it eventually.