CompAndSave offers the Brother LC75 XL-Compatible Inkjet Cartridge 4-Pack for $15.96. Coupon code "CRAZY75" cuts it to 1 cent. With $3.99 for shipping, that's the lowest total price we could find by $16. (For further comparison, we saw a 10-pack for $13 shipped in January.) It comes with one each of black, cyan, magenta, and yellow inks. Deal ends August 31.