CompAndSave offers this refurbished HP 970XL- and 971XL-Compatible Inkjet Cartridge 4-Pack for $185.96. Coupon code "DEAL970" cuts it to $135.96. Also, free shipping applies. This set features one each of black, cyan, magenta, and yellow ink cartridges. A 1-year CompAndSave warranty applies. Deal ends February 16.
At CompAndSave, buy one select ink cartridge and get two for free via the coupon under each product. Shipping adds $3.99, but orders of $50 or more bag free shipping. Choose from cartridges for brands like HP, Brother, Canon, and Kodak.
Linkyo via Amazon offers Prime members the Linkyo Brother TN450 and TN420 Compatible High-Yield Toner Cartridge 2-Pack for $18.98 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $8.43.) That's $3 under our August mention's per-unit price and the best deal we've seen. (It's also a current price low by $11.) It delivers estimated an print yield of 2,600 pages per cartridge.