E-Auctions-Express via eBay offers this Canon-Compatible PGI-220 / CLI-221 Inkjet Cartridge 6-Pack with chip for $5.93 with free shipping. (JCB Park via Amazon charges pennies for a similar set for Prime members.) That's $0.99 per cartridge and $4 below the lowest total price we could find for this quantity of such ink cartridges. (For further comparison, we saw a 5-pack of similar cartridges for this same price in November.) It includes two large black, one small black, one cyan, one yellow, and one magenta cartridge.