At ComboInk, buy one HP 564XL-Compatible Inkjet Cartridge 5-Pack
and get one more
via coupon code "DLNBOGO564". (Add two 5-packs to your cart, then apply the coupon.) Shipping adds $3.99
, or spend over $50 to qualify for free shipping. Each 5-pack features one each of black, photo black, cyan, magenta, and yellow ink cartridges. A 1-year ComboInk warranty applies. Deal ends October 4.