Cartridge Warehouse via Amazon offers the Canon-Compatible PGI-220 / CLI-221 Inkjet Cartridge 5-Pack
with free shipping
. That's $1.10 per cartridge and the lowest total price we could find for this quantity by a buck, although we saw it for a buck less last month. These cartridges fit several types of Canon PIXMA inkjet printers. It includes one cyan, yellow, and magenta cartridge and two black cartridges..