Go Inks C-520 & C-521 Compatible Set of 5 Ink Cartridges to replace Canon PGI-520 & CLI-521 for use with Canon PIXMA Printers (Pack of 10) : Amazon.co.uk: Computers & Accessories
ABCToner - Compatible printer cartridge For Canon 521 black Pixma IP3600 IP4600 IP4700 MP540 MP550 MP560 MP620 MP630 MP640 MP640R MP980 MP990 MX860 MX870 by ABC