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.
Cartridge Warehouse via Amazon offers the remanufactured Epson Stylus Photo T048 Inkjet Cartridge 7-Pack (two black, one of each color) for $6.99 with free shipping. That's pennies below our January mention and the lowest total price we could find by $3. It's compatible with many Epson Stylus Photo printers.
TonerDeal via Amazon still offers a Canon-Compatible PGI-225 / CLI-226 Inkjet Cartridge 10-Pack for $2.76 plus $4.99 for shipping. Outside the price below, that's the lowest total price we could find by $4, although we saw this quantity for $1 less in November. These cartridges fit several types of Canon PIXMA printers.
A close price: Meritline has a similar 10-pack (two 5-packs) for $14.95 via coupon code "MLCR26TN", $7.95 after, with free shipping.