Meritline offers the G&G PGI-250XL / CLI-251XL Canon-Compatible Inkjet Cartridge 5-Pack with Chip for $20.95. Coupon code "MLCW14XN" cuts it to $14.95. With free shipping, that's tied with our mention from February as the lowest total price we've seen. (It's also a current low by $18.) These cartridges fit several types of Canon inkjet printers; use the compatibility chart on the product page to check specific models.