You can buy various Canon cartridges and cleaning cartridges from the websites listed below:
Canon Cleaning cartridges 570/571 5-pack
Canon Cleaning cartridges 550/551 XL 5-pack
Canon 571 Grey
Canon 525/526 XL Cleaning cartridges 5-pack
Canon 520/521 XL Cleaning cartridges 5-pack
Canon 520/521 XL 5-pack
Canon 551 Inkcartridge Grey
Canon 580/581 Cleaning cartridges 5-pack