The TR7520’s cost-per-print is great. The ink cartridges are reasonably priced, so the overall cost over time doesn’t rise as quickly even if you print a lot. You can buy the ink cartridges individually, but it’s usually cheaper to buy it as a bundle. If you purchase your printer directly from Canon, you’re also eligible to enroll in their ‘Auto-Replenishment Service’ during the checkout process, which is an ink subscription service.
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.